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-rw-r--r--test/analysis/data_flow.py284
-rw-r--r--test/analysis/depgraph.py306
-rwxr-xr-xtest/arch/arm/sem.py4
-rwxr-xr-xtest/arch/msp430/sem.py4
-rwxr-xr-xtest/arch/x86/sem.py17
-rw-r--r--test/arch/x86/unit/mn_cdq.py38
-rwxr-xr-xtest/arch/x86/unit/mn_pushpop.py24
-rwxr-xr-xtest/arch/x86/unit/mn_strings.py9
-rw-r--r--test/core/asmblock.py313
-rw-r--r--test/core/graph.py2
-rwxr-xr-xtest/core/parse_asm.py17
-rw-r--r--test/core/sembuilder.py20
-rw-r--r--test/expression/parser.py3
-rw-r--r--test/ir/translators/z3_ir.py51
14 files changed, 568 insertions, 524 deletions
diff --git a/test/analysis/data_flow.py b/test/analysis/data_flow.py
index d0a85e13..c3469109 100644
--- a/test/analysis/data_flow.py
+++ b/test/analysis/data_flow.py
@@ -1,10 +1,12 @@
 """ Test cases for dead code elimination"""
 from miasm2.expression.expression import ExprId, ExprInt, ExprAff, ExprMem
-from miasm2.core.asmblock import AsmLabel
+from miasm2.core.asmblock import AsmSymbolPool
 from miasm2.analysis.data_flow import *
 from miasm2.ir.analysis import ira
 from miasm2.ir.ir import IRBlock, AssignBlock
 
+symbol_pool = AsmSymbolPool()
+
 a = ExprId("a", 32)
 b = ExprId("b", 32)
 c = ExprId("c", 32)
@@ -24,13 +26,13 @@ CST1 = ExprInt(0x11, 32)
 CST2 = ExprInt(0x12, 32)
 CST3 = ExprInt(0x13, 32)
 
-LBL0 = AsmLabel("lbl0")
-LBL1 = AsmLabel("lbl1")
-LBL2 = AsmLabel("lbl2")
-LBL3 = AsmLabel("lbl3")
-LBL4 = AsmLabel("lbl4")
-LBL5 = AsmLabel("lbl5")
-LBL6 = AsmLabel("lbl6")
+LBL0 = symbol_pool.add_location("lbl0", 0)
+LBL1 = symbol_pool.add_location("lbl1", 1)
+LBL2 = symbol_pool.add_location("lbl2", 2)
+LBL3 = symbol_pool.add_location("lbl3", 3)
+LBL4 = symbol_pool.add_location("lbl4", 4)
+LBL5 = symbol_pool.add_location("lbl5", 5)
+LBL6 = symbol_pool.add_location("lbl6", 6)
 
 IRDst = ExprId('IRDst', 32)
 dummy = ExprId('dummy', 32)
@@ -77,106 +79,106 @@ class IRATest(ira):
 
 # graph 1 : Simple graph with dead and alive variables
 
-G1_IRA = IRATest()
+G1_IRA = IRATest(symbol_pool)
 
 G1_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(b, CST2)]])
 G1_IRB1 = gen_irblock(LBL1, [[ExprAff(a, b)]])
 G1_IRB2 = gen_irblock(LBL2, [[ExprAff(r, a)]])
 
-G1_IRA.blocks = {irb.label : irb for irb in [G1_IRB0, G1_IRB1, G1_IRB2]}
+G1_IRA.blocks = {irb.loc_key : irb for irb in [G1_IRB0, G1_IRB1, G1_IRB2]}
 
-G1_IRA.graph.add_uniq_edge(G1_IRB0.label, G1_IRB1.label)
-G1_IRA.graph.add_uniq_edge(G1_IRB1.label, G1_IRB2.label)
+G1_IRA.graph.add_uniq_edge(G1_IRB0.loc_key, G1_IRB1.loc_key)
+G1_IRA.graph.add_uniq_edge(G1_IRB1.loc_key, G1_IRB2.loc_key)
 
 # Expected output for graph 1
-G1_EXP_IRA = IRATest()
+G1_EXP_IRA = IRATest(symbol_pool)
 
 G1_EXP_IRB0 = gen_irblock(LBL0, [[], [ExprAff(b, CST2)]])
 G1_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(a, b)]])
 G1_EXP_IRB2 = gen_irblock(LBL2, [[ExprAff(r, a)]])
 
-G1_EXP_IRA.blocks = {irb.label : irb for irb in [G1_EXP_IRB0, G1_EXP_IRB1,
+G1_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G1_EXP_IRB0, G1_EXP_IRB1,
                                                  G1_EXP_IRB2]}
 
 # graph 2 : Natural loop with dead variable
 
-G2_IRA = IRATest()
+G2_IRA = IRATest(symbol_pool)
 
 G2_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(r, CST1)]])
 G2_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
 G2_IRB2 = gen_irblock(LBL2, [[ExprAff(a, r)]])
 
-G2_IRA.blocks = {irb.label : irb for irb in [G2_IRB0, G2_IRB1, G2_IRB2]}
+G2_IRA.blocks = {irb.loc_key : irb for irb in [G2_IRB0, G2_IRB1, G2_IRB2]}
 
-G2_IRA.graph.add_uniq_edge(G2_IRB0.label, G2_IRB1.label)
-G2_IRA.graph.add_uniq_edge(G2_IRB1.label, G2_IRB2.label)
-G2_IRA.graph.add_uniq_edge(G2_IRB1.label, G2_IRB1.label)
+G2_IRA.graph.add_uniq_edge(G2_IRB0.loc_key, G2_IRB1.loc_key)
+G2_IRA.graph.add_uniq_edge(G2_IRB1.loc_key, G2_IRB2.loc_key)
+G2_IRA.graph.add_uniq_edge(G2_IRB1.loc_key, G2_IRB1.loc_key)
 
 # Expected output for graph 2
-G2_EXP_IRA = IRATest()
+G2_EXP_IRA = IRATest(symbol_pool)
 
 G2_EXP_IRB0 = gen_irblock(LBL0, [[], [ExprAff(r, CST1)]])
 G2_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G2_EXP_IRB2 = gen_irblock(LBL2, [[]])
 
-G2_EXP_IRA.blocks = {irb.label : irb for irb in [G2_EXP_IRB0, G2_EXP_IRB1,
+G2_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G2_EXP_IRB0, G2_EXP_IRB1,
                                                  G2_EXP_IRB2]}
 
 # graph 3 : Natural loop with alive variables
 
-G3_IRA = IRATest()
+G3_IRA = IRATest(symbol_pool)
 
 G3_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G3_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
 G3_IRB2 = gen_irblock(LBL2, [[ExprAff(r, a)]])
 
-G3_IRA.blocks = {irb.label : irb for irb in [G3_IRB0, G3_IRB1, G3_IRB2]}
+G3_IRA.blocks = {irb.loc_key : irb for irb in [G3_IRB0, G3_IRB1, G3_IRB2]}
 
-G3_IRA.graph.add_uniq_edge(G3_IRB0.label, G3_IRB1.label)
-G3_IRA.graph.add_uniq_edge(G3_IRB1.label, G3_IRB2.label)
-G3_IRA.graph.add_uniq_edge(G3_IRB1.label, G3_IRB1.label)
+G3_IRA.graph.add_uniq_edge(G3_IRB0.loc_key, G3_IRB1.loc_key)
+G3_IRA.graph.add_uniq_edge(G3_IRB1.loc_key, G3_IRB2.loc_key)
+G3_IRA.graph.add_uniq_edge(G3_IRB1.loc_key, G3_IRB1.loc_key)
 
 # Expected output for graph 3
-G3_EXP_IRA = IRATest()
+G3_EXP_IRA = IRATest(symbol_pool)
 
 G3_EXP_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G3_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
 G3_EXP_IRB2 = gen_irblock(LBL2, [[ExprAff(r, a)]])
 
-G3_EXP_IRA.blocks = {irb.label : irb for irb in [G3_EXP_IRB0, G3_EXP_IRB1,
+G3_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G3_EXP_IRB0, G3_EXP_IRB1,
                                                  G3_EXP_IRB2]}
 
 # graph 4 : If/else with dead variables
 
-G4_IRA = IRATest()
+G4_IRA = IRATest(symbol_pool)
 
 G4_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G4_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
 G4_IRB2 = gen_irblock(LBL2, [[ExprAff(a, a+CST2)]])
 G4_IRB3 = gen_irblock(LBL3, [[ExprAff(a, CST3)], [ExprAff(r, a)]])
 
-G4_IRA.blocks = {irb.label : irb for irb in [G4_IRB0, G4_IRB1, G4_IRB2,
+G4_IRA.blocks = {irb.loc_key : irb for irb in [G4_IRB0, G4_IRB1, G4_IRB2,
                                             G4_IRB3]}
 
-G4_IRA.graph.add_uniq_edge(G4_IRB0.label, G4_IRB1.label)
-G4_IRA.graph.add_uniq_edge(G4_IRB0.label, G4_IRB2.label)
-G4_IRA.graph.add_uniq_edge(G4_IRB1.label, G4_IRB3.label)
-G4_IRA.graph.add_uniq_edge(G4_IRB2.label, G4_IRB3.label)
+G4_IRA.graph.add_uniq_edge(G4_IRB0.loc_key, G4_IRB1.loc_key)
+G4_IRA.graph.add_uniq_edge(G4_IRB0.loc_key, G4_IRB2.loc_key)
+G4_IRA.graph.add_uniq_edge(G4_IRB1.loc_key, G4_IRB3.loc_key)
+G4_IRA.graph.add_uniq_edge(G4_IRB2.loc_key, G4_IRB3.loc_key)
 
 # Expected output for graph 4
-G4_EXP_IRA = IRATest()
+G4_EXP_IRA = IRATest(symbol_pool)
 
 G4_EXP_IRB0 = gen_irblock(LBL0, [[]])
 G4_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G4_EXP_IRB2 = gen_irblock(LBL2, [[]])
 G4_EXP_IRB3 = gen_irblock(LBL3, [[ExprAff(a, CST3)], [ExprAff(r, a)]])
 
-G4_EXP_IRA.blocks = {irb.label : irb for irb in [G4_EXP_IRB0, G4_EXP_IRB1,
+G4_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G4_EXP_IRB0, G4_EXP_IRB1,
                                                  G4_EXP_IRB2, G4_EXP_IRB3]}
 
 # graph 5 : Loop and If/else with dead variables
 
-G5_IRA = IRATest()
+G5_IRA = IRATest(symbol_pool)
 
 G5_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G5_IRB1 = gen_irblock(LBL1, [[ExprAff(r, CST2)]])
@@ -185,19 +187,19 @@ G5_IRB3 = gen_irblock(LBL3, [[ExprAff(a, a+CST3)]])
 G5_IRB4 = gen_irblock(LBL4, [[ExprAff(a, a+CST1)]])
 G5_IRB5 = gen_irblock(LBL5, [[ExprAff(a, r)]])
 
-G5_IRA.blocks = {irb.label : irb for irb in [G5_IRB0, G5_IRB1, G5_IRB2, G5_IRB3,
+G5_IRA.blocks = {irb.loc_key : irb for irb in [G5_IRB0, G5_IRB1, G5_IRB2, G5_IRB3,
                                             G5_IRB4, G5_IRB5]}
 
-G5_IRA.graph.add_uniq_edge(G5_IRB0.label, G5_IRB1.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB1.label, G5_IRB2.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB1.label, G5_IRB3.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB2.label, G5_IRB4.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB3.label, G5_IRB4.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB4.label, G5_IRB5.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB4.label, G5_IRB1.label)
+G5_IRA.graph.add_uniq_edge(G5_IRB0.loc_key, G5_IRB1.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB1.loc_key, G5_IRB2.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB1.loc_key, G5_IRB3.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB2.loc_key, G5_IRB4.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB3.loc_key, G5_IRB4.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB4.loc_key, G5_IRB5.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB4.loc_key, G5_IRB1.loc_key)
 
 # Expected output for graph 5
-G5_EXP_IRA = IRATest()
+G5_EXP_IRA = IRATest(symbol_pool)
 
 G5_EXP_IRB0 = gen_irblock(LBL0, [[]])
 G5_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, CST2)]])
@@ -206,72 +208,72 @@ G5_EXP_IRB3 = gen_irblock(LBL3, [[]])
 G5_EXP_IRB4 = gen_irblock(LBL4, [[]])
 G5_EXP_IRB5 = gen_irblock(LBL5, [[]])
 
-G5_EXP_IRA.blocks = {irb.label : irb for irb in [G5_EXP_IRB0, G5_EXP_IRB1,
+G5_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G5_EXP_IRB0, G5_EXP_IRB1,
                                                  G5_EXP_IRB2, G5_EXP_IRB3,
                                                  G5_EXP_IRB4, G5_EXP_IRB5]}
 
 # graph 6 : Natural loop with dead variables symetric affectation
 # (a = b <-> b = a )
 
-G6_IRA = IRATest()
+G6_IRA = IRATest(symbol_pool)
 
 G6_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G6_IRB1 = gen_irblock(LBL1, [[ExprAff(b, a)]])
 G6_IRB2 = gen_irblock(LBL2, [[ExprAff(a, b)]])
 G6_IRB3 = gen_irblock(LBL3, [[ExprAff(r, CST2)]])
 
-G6_IRA.blocks = {irb.label : irb for irb in [G6_IRB0, G6_IRB1, G6_IRB2,
+G6_IRA.blocks = {irb.loc_key : irb for irb in [G6_IRB0, G6_IRB1, G6_IRB2,
                                             G6_IRB3]}
 
-G6_IRA.graph.add_uniq_edge(G6_IRB0.label, G6_IRB1.label)
-G6_IRA.graph.add_uniq_edge(G6_IRB1.label, G6_IRB2.label)
-G6_IRA.graph.add_uniq_edge(G6_IRB2.label, G6_IRB1.label)
-G6_IRA.graph.add_uniq_edge(G6_IRB2.label, G6_IRB3.label)
+G6_IRA.graph.add_uniq_edge(G6_IRB0.loc_key, G6_IRB1.loc_key)
+G6_IRA.graph.add_uniq_edge(G6_IRB1.loc_key, G6_IRB2.loc_key)
+G6_IRA.graph.add_uniq_edge(G6_IRB2.loc_key, G6_IRB1.loc_key)
+G6_IRA.graph.add_uniq_edge(G6_IRB2.loc_key, G6_IRB3.loc_key)
 
 # Expected output for graph 6
-G6_EXP_IRA = IRATest()
+G6_EXP_IRA = IRATest(symbol_pool)
 
 G6_EXP_IRB0 = gen_irblock(LBL0, [[]])
 G6_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G6_EXP_IRB2 = gen_irblock(LBL2, [[]])
 G6_EXP_IRB3 = gen_irblock(LBL3, [[ExprAff(r, CST2)]])
 
-G6_EXP_IRA.blocks = {irb.label : irb for irb in [G6_EXP_IRB0, G6_EXP_IRB1,
+G6_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G6_EXP_IRB0, G6_EXP_IRB1,
                                                  G6_EXP_IRB2, G6_EXP_IRB3]}
 
 # graph 7 : Double entry loop with dead variables
 
-G7_IRA = IRATest()
+G7_IRA = IRATest(symbol_pool)
 
 G7_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(r, CST1)]])
 G7_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
 G7_IRB2 = gen_irblock(LBL2, [[ExprAff(a, a+CST2)]])
 G7_IRB3 = gen_irblock(LBL3, [[ExprAff(a, r)]])
 
-G7_IRA.blocks = {irb.label : irb for irb in [G7_IRB0, G7_IRB1, G7_IRB2,
+G7_IRA.blocks = {irb.loc_key : irb for irb in [G7_IRB0, G7_IRB1, G7_IRB2,
                                             G7_IRB3]}
 
-G7_IRA.graph.add_uniq_edge(G7_IRB0.label, G7_IRB1.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB1.label, G7_IRB2.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB2.label, G7_IRB1.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB2.label, G7_IRB3.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB0.label, G7_IRB2.label)
+G7_IRA.graph.add_uniq_edge(G7_IRB0.loc_key, G7_IRB1.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB1.loc_key, G7_IRB2.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB2.loc_key, G7_IRB1.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB2.loc_key, G7_IRB3.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB0.loc_key, G7_IRB2.loc_key)
 
 
 # Expected output for graph 7
-G7_EXP_IRA = IRATest()
+G7_EXP_IRA = IRATest(symbol_pool)
 
 G7_EXP_IRB0 = gen_irblock(LBL0, [[], [ExprAff(r, CST1)]])
 G7_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G7_EXP_IRB2 = gen_irblock(LBL2, [[]])
 G7_EXP_IRB3 = gen_irblock(LBL3, [[]])
 
-G7_EXP_IRA.blocks = {irb.label : irb for irb in [G7_EXP_IRB0, G7_EXP_IRB1,
+G7_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G7_EXP_IRB0, G7_EXP_IRB1,
                                                  G7_EXP_IRB2, G7_EXP_IRB3]}
 
 # graph 8 : Nested loops with dead variables
 
-G8_IRA = IRATest()
+G8_IRA = IRATest(symbol_pool)
 
 G8_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(b, CST1)]])
 G8_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)]])
@@ -279,31 +281,31 @@ G8_IRB2 = gen_irblock(LBL2, [[ExprAff(b, b+CST2)]])
 G8_IRB3 = gen_irblock(LBL3, [[ExprAff(a, b)]])
 
 
-G8_IRA.blocks = {irb.label : irb for irb in [G8_IRB0, G8_IRB1, G8_IRB2,
+G8_IRA.blocks = {irb.loc_key : irb for irb in [G8_IRB0, G8_IRB1, G8_IRB2,
                                             G8_IRB3]}
 
-G8_IRA.graph.add_uniq_edge(G8_IRB0.label, G8_IRB1.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB1.label, G8_IRB2.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB2.label, G8_IRB1.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB2.label, G8_IRB3.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB3.label, G8_IRB2.label)
+G8_IRA.graph.add_uniq_edge(G8_IRB0.loc_key, G8_IRB1.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB1.loc_key, G8_IRB2.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB2.loc_key, G8_IRB1.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB2.loc_key, G8_IRB3.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB3.loc_key, G8_IRB2.loc_key)
 
 
 # Expected output for graph 8
 
-G8_EXP_IRA = IRATest()
+G8_EXP_IRA = IRATest(symbol_pool)
 
 G8_EXP_IRB0 = gen_irblock(LBL0, [[], []])
 G8_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G8_EXP_IRB2 = gen_irblock(LBL2, [[]])
 G8_EXP_IRB3 = gen_irblock(LBL3, [[]])
 
-G8_EXP_IRA.blocks = {irb.label : irb for irb in [G8_EXP_IRB0, G8_EXP_IRB1,
+G8_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G8_EXP_IRB0, G8_EXP_IRB1,
                                                  G8_EXP_IRB2, G8_EXP_IRB3]}
 
 # graph 9 : Miultiple-exits loops with dead variables
 
-G9_IRA = IRATest()
+G9_IRA = IRATest(symbol_pool)
 
 G9_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(b, CST1)]])
 G9_IRB1 = gen_irblock(LBL1, [[ExprAff(a, a+CST1)], [ExprAff(b, b+CST1)]])
@@ -311,22 +313,22 @@ G9_IRB2 = gen_irblock(LBL2, [[ExprAff(a, a+CST2)], [ExprAff(b, b+CST2)]])
 G9_IRB3 = gen_irblock(LBL3, [[ExprAff(a, b)]])
 G9_IRB4 = gen_irblock(LBL4, [[ExprAff(r, a)], [ExprAff(r, b)]])
 
-G9_IRA.blocks = {irb.label : irb for irb in [G9_IRB0, G9_IRB1, G9_IRB2,
+G9_IRA.blocks = {irb.loc_key : irb for irb in [G9_IRB0, G9_IRB1, G9_IRB2,
                                             G9_IRB3, G9_IRB4]}
 
-G9_IRA.graph.add_uniq_edge(G9_IRB0.label, G9_IRB4.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB0.label, G9_IRB1.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB1.label, G9_IRB0.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB1.label, G9_IRB4.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB1.label, G9_IRB2.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB2.label, G9_IRB0.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB2.label, G9_IRB3.label)
-G9_IRA.graph.add_uniq_edge(G9_IRB3.label, G9_IRB4.label)
+G9_IRA.graph.add_uniq_edge(G9_IRB0.loc_key, G9_IRB4.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB0.loc_key, G9_IRB1.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB1.loc_key, G9_IRB0.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB1.loc_key, G9_IRB4.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB1.loc_key, G9_IRB2.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB2.loc_key, G9_IRB0.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB2.loc_key, G9_IRB3.loc_key)
+G9_IRA.graph.add_uniq_edge(G9_IRB3.loc_key, G9_IRB4.loc_key)
 
 
 # Expected output for graph 9
 
-G9_EXP_IRA = IRATest()
+G9_EXP_IRA = IRATest(symbol_pool)
 
 G9_EXP_IRB0 = gen_irblock(LBL0, [[], [ExprAff(b, CST1)]])
 G9_EXP_IRB1 = gen_irblock(LBL1, [[], [ExprAff(b, b+CST1)]])
@@ -334,42 +336,42 @@ G9_EXP_IRB2 = gen_irblock(LBL2, [[], [ExprAff(b, b+CST2)]])
 G9_EXP_IRB3 = gen_irblock(LBL3, [[]])
 G9_EXP_IRB4 = gen_irblock(LBL4, [[], [ExprAff(r, b)]])
 
-G9_EXP_IRA.blocks = {irb.label : irb for irb in [G9_EXP_IRB0, G9_EXP_IRB1,
+G9_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G9_EXP_IRB0, G9_EXP_IRB1,
                                                  G9_EXP_IRB2, G9_EXP_IRB3,
                                                  G9_EXP_IRB4]}
 
 # graph 10 : Natural loop with alive variables symetric affectation
 # (a = b <-> b = a )
 
-G10_IRA = IRATest()
+G10_IRA = IRATest(symbol_pool)
 
 G10_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)]])
 G10_IRB1 = gen_irblock(LBL1, [[ExprAff(b, a)]])
 G10_IRB2 = gen_irblock(LBL2, [[ExprAff(a, b)]])
 G10_IRB3 = gen_irblock(LBL3, [[ExprAff(r, CST1)]])
 
-G10_IRA.blocks = {irb.label : irb for irb in [G10_IRB0, G10_IRB1,
+G10_IRA.blocks = {irb.loc_key : irb for irb in [G10_IRB0, G10_IRB1,
                                              G10_IRB2, G10_IRB3]}
 
-G10_IRA.graph.add_uniq_edge(G10_IRB0.label, G10_IRB1.label)
-G10_IRA.graph.add_uniq_edge(G10_IRB1.label, G10_IRB2.label)
-G10_IRA.graph.add_uniq_edge(G10_IRB2.label, G10_IRB1.label)
-G10_IRA.graph.add_uniq_edge(G10_IRB2.label, G10_IRB3.label)
+G10_IRA.graph.add_uniq_edge(G10_IRB0.loc_key, G10_IRB1.loc_key)
+G10_IRA.graph.add_uniq_edge(G10_IRB1.loc_key, G10_IRB2.loc_key)
+G10_IRA.graph.add_uniq_edge(G10_IRB2.loc_key, G10_IRB1.loc_key)
+G10_IRA.graph.add_uniq_edge(G10_IRB2.loc_key, G10_IRB3.loc_key)
 
 # Expected output for graph 10
-G10_EXP_IRA = IRATest()
+G10_EXP_IRA = IRATest(symbol_pool)
 
 G10_EXP_IRB0 = gen_irblock(LBL0, [[]])
 G10_EXP_IRB1 = gen_irblock(LBL1, [[]])
 G10_EXP_IRB2 = gen_irblock(LBL2, [[]])
 G10_EXP_IRB3 = gen_irblock(LBL3, [[ExprAff(r, CST1)]])
 
-G10_EXP_IRA.blocks = {irb.label : irb for irb in [G10_EXP_IRB0, G10_EXP_IRB1,
+G10_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G10_EXP_IRB0, G10_EXP_IRB1,
                                                   G10_EXP_IRB2, G10_EXP_IRB3]}
 
 # graph 11 : If/Else conditions with alive variables
 
-G11_IRA = IRATest()
+G11_IRA = IRATest(symbol_pool)
 
 G11_IRB0 = gen_irblock(LBL0, [[ExprAff(a, b)]])
 G11_IRB1 = gen_irblock(LBL1, [[ExprAff(b, a)]])
@@ -378,17 +380,17 @@ G11_IRB3 = gen_irblock(LBL3, [[ExprAff(a, a+CST1)]])
 G11_IRB4 = gen_irblock(LBL4, [[ExprAff(b, b+CST1)]])
 
 
-G11_IRA.blocks = {irb.label : irb for irb in [G11_IRB0, G11_IRB1, G11_IRB2]}
+G11_IRA.blocks = {irb.loc_key : irb for irb in [G11_IRB0, G11_IRB1, G11_IRB2]}
 
-G11_IRA.graph.add_uniq_edge(G11_IRB0.label, G11_IRB1.label)
-#G11_IRA.graph.add_uniq_edge(G11_IRB3.label, G11_IRB1.label)
-G11_IRA.graph.add_uniq_edge(G11_IRB1.label, G11_IRB0.label)
-#G11_IRA.graph.add_uniq_edge(G11_IRB4.label, G11_IRB0.label)
-G11_IRA.graph.add_uniq_edge(G11_IRB1.label, G11_IRB2.label)
+G11_IRA.graph.add_uniq_edge(G11_IRB0.loc_key, G11_IRB1.loc_key)
+#G11_IRA.graph.add_uniq_edge(G11_IRB3.loc_key, G11_IRB1.loc_key)
+G11_IRA.graph.add_uniq_edge(G11_IRB1.loc_key, G11_IRB0.loc_key)
+#G11_IRA.graph.add_uniq_edge(G11_IRB4.loc_key, G11_IRB0.loc_key)
+G11_IRA.graph.add_uniq_edge(G11_IRB1.loc_key, G11_IRB2.loc_key)
 
 
 # Expected output for graph 11
-G11_EXP_IRA = IRATest()
+G11_EXP_IRA = IRATest(symbol_pool)
 
 G11_EXP_IRB0 = gen_irblock(LBL0, [[ExprAff(a, b)]])
 G11_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(b, a)]])
@@ -396,13 +398,13 @@ G11_EXP_IRB2 = gen_irblock(LBL2, [[ExprAff(r, a)]])
 #G11_EXP_IRB3 = gen_irblock(LBL3, [[ExprAff(a, a+CST1)]])
 #G11_EXP_IRB4 = gen_irblock(LBL4, [[ExprAff(b, b+CST1)]])
 
-G11_EXP_IRA.blocks = {irb.label : irb for irb in [G11_EXP_IRB0, G11_EXP_IRB1,
+G11_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G11_EXP_IRB0, G11_EXP_IRB1,
                                                   G11_EXP_IRB2]}
 
 # graph 12 : Graph with multiple out points and useless definitions
 # of return register
 
-G12_IRA = IRATest()
+G12_IRA = IRATest(symbol_pool)
 
 G12_IRB0 = gen_irblock(LBL0, [[ExprAff(r, CST1)], [ExprAff(a, CST2)]])
 G12_IRB1 = gen_irblock(LBL1, [[ExprAff(r, CST2)]])
@@ -411,17 +413,17 @@ G12_IRB3 = gen_irblock(LBL3, [[ExprAff(r, CST3)]])
 G12_IRB4 = gen_irblock(LBL4, [[ExprAff(r, CST2)]])
 G12_IRB5 = gen_irblock(LBL5, [[ExprAff(r, b)]])
 
-G12_IRA.blocks = {irb.label : irb for irb in [G12_IRB0, G12_IRB1, G12_IRB2,
+G12_IRA.blocks = {irb.loc_key : irb for irb in [G12_IRB0, G12_IRB1, G12_IRB2,
                                              G12_IRB3, G12_IRB4, G12_IRB5]}
 
-G12_IRA.graph.add_uniq_edge(G12_IRB0.label, G12_IRB1.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB0.label, G12_IRB2.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB2.label, G12_IRB3.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB2.label, G12_IRB4.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB4.label, G12_IRB5.label)
+G12_IRA.graph.add_uniq_edge(G12_IRB0.loc_key, G12_IRB1.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB0.loc_key, G12_IRB2.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB2.loc_key, G12_IRB3.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB2.loc_key, G12_IRB4.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB4.loc_key, G12_IRB5.loc_key)
 
 # Expected output for graph 12
-G12_EXP_IRA = IRATest()
+G12_EXP_IRA = IRATest(symbol_pool)
 
 G12_EXP_IRB0 = gen_irblock(LBL0, [[], []])
 G12_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, CST2)]])
@@ -431,13 +433,13 @@ G12_EXP_IRB4 = gen_irblock(LBL4, [[]])
 G12_EXP_IRB5 = gen_irblock(LBL5, [[ExprAff(r, b)]])
 
 
-G12_EXP_IRA.blocks = {irb.label : irb for irb in [G12_EXP_IRB0, G12_EXP_IRB1,
+G12_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G12_EXP_IRB0, G12_EXP_IRB1,
                                                   G12_EXP_IRB2, G12_EXP_IRB3,
                                                   G12_EXP_IRB4, G12_EXP_IRB5]}
 
 # graph 13 : Graph where a leaf has lost its son
 
-G13_IRA = IRATest()
+G13_IRA = IRATest(symbol_pool)
 
 G13_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(b, CST2)]])
 G13_IRB1 = gen_irblock(LBL1, [[ExprAff(r, b)]])
@@ -446,16 +448,16 @@ G13_IRB2 = gen_irblock(LBL2, [[ExprAff(d, CST2)], [ExprAff(a, b+CST1),
 G13_IRB3 = gen_irblock(LBL3, [[]]) # lost son
 G13_IRB4 = gen_irblock(LBL4, [[ExprAff(b, CST2)]])
 
-G13_IRA.blocks = {irb.label : irb for irb in [G13_IRB0, G13_IRB1, G13_IRB2,
+G13_IRA.blocks = {irb.loc_key : irb for irb in [G13_IRB0, G13_IRB1, G13_IRB2,
                                              G13_IRB4]}
 
-G13_IRA.graph.add_uniq_edge(G13_IRB0.label, G13_IRB1.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB0.label, G13_IRB4.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB2.label, G13_IRB3.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB4.label, G13_IRB2.label)
+G13_IRA.graph.add_uniq_edge(G13_IRB0.loc_key, G13_IRB1.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB0.loc_key, G13_IRB4.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB2.loc_key, G13_IRB3.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB4.loc_key, G13_IRB2.loc_key)
 
 # Expected output for graph 13
-G13_EXP_IRA = IRATest()
+G13_EXP_IRA = IRATest(symbol_pool)
 
 G13_EXP_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(b, CST2)]])
 G13_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, b)]])
@@ -464,7 +466,7 @@ G13_EXP_IRB2 = gen_irblock(LBL2, [[ExprAff(d, CST2)], [ExprAff(a, b+CST1),
 G13_EXP_IRB3 = gen_irblock(LBL3, [[]])
 G13_EXP_IRB4 = gen_irblock(LBL4, [[ExprAff(b, CST2)]])
 
-G13_EXP_IRA.blocks = {irb.label: irb for irb in [G13_EXP_IRB0, G13_EXP_IRB1,
+G13_EXP_IRA.blocks = {irb.loc_key: irb for irb in [G13_EXP_IRB0, G13_EXP_IRB1,
                                                  G13_EXP_IRB2, G13_EXP_IRB4]}
 
 #G13_EXP_IRA = G13_IRA
@@ -472,50 +474,50 @@ G13_EXP_IRA.blocks = {irb.label: irb for irb in [G13_EXP_IRB0, G13_EXP_IRB1,
 # graph 14 : Graph where variable assigned multiple times in a block but still
 # useful in the end
 
-G14_IRA = IRATest()
+G14_IRA = IRATest(symbol_pool)
 
 G14_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(c, a)],
                               [ExprAff(a, CST2)]])
 G14_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a+c)]])
 
-G14_IRA.blocks = {irb.label : irb for irb in [G14_IRB0, G14_IRB1]}
+G14_IRA.blocks = {irb.loc_key : irb for irb in [G14_IRB0, G14_IRB1]}
 
-G14_IRA.graph.add_uniq_edge(G14_IRB0.label, G14_IRB1.label)
+G14_IRA.graph.add_uniq_edge(G14_IRB0.loc_key, G14_IRB1.loc_key)
 
 # Expected output for graph 1
-G14_EXP_IRA = IRATest()
+G14_EXP_IRA = IRATest(symbol_pool)
 
 G14_EXP_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1)], [ExprAff(c, a)],
                                   [ExprAff(a, CST2)]])
 G14_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a+c)]])
 
-G14_EXP_IRA.blocks = {irb.label: irb for irb in [G14_EXP_IRB0, G14_EXP_IRB1]}
+G14_EXP_IRA.blocks = {irb.loc_key: irb for irb in [G14_EXP_IRB0, G14_EXP_IRB1]}
 
 # graph 15 : Graph where variable assigned multiple and read at the same time,
 # but useless
 
-G15_IRA = IRATest()
+G15_IRA = IRATest(symbol_pool)
 
 G15_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST2)], [ExprAff(a, CST1),
                                                    ExprAff(b, a+CST2),
                                                    ExprAff(c, CST1)]])
 G15_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a)]])
 
-G15_IRA.blocks = {irb.label : irb for irb in [G15_IRB0, G15_IRB1]}
+G15_IRA.blocks = {irb.loc_key : irb for irb in [G15_IRB0, G15_IRB1]}
 
-G15_IRA.graph.add_uniq_edge(G15_IRB0.label, G15_IRB1.label)
+G15_IRA.graph.add_uniq_edge(G15_IRB0.loc_key, G15_IRB1.loc_key)
 
 # Expected output for graph 1
-G15_EXP_IRA = IRATest()
+G15_EXP_IRA = IRATest(symbol_pool)
 
 G15_EXP_IRB0 = gen_irblock(LBL0, [[], [ExprAff(a, CST1)]])
 G15_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a)]])
 
-G15_EXP_IRA.blocks = {irb.label: irb for irb in [G15_EXP_IRB0, G15_EXP_IRB1]}
+G15_EXP_IRA.blocks = {irb.loc_key: irb for irb in [G15_EXP_IRB0, G15_EXP_IRB1]}
 
 # graph 16 : Graph where variable assigned multiple times in the same bloc
 
-G16_IRA = IRATest()
+G16_IRA = IRATest(symbol_pool)
 
 G16_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1), ExprAff(b, CST2),
                                ExprAff(c, CST3)], [ExprAff(a, c+CST1),
@@ -523,25 +525,25 @@ G16_IRB0 = gen_irblock(LBL0, [[ExprAff(a, CST1), ExprAff(b, CST2),
 G16_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a+b)], [ExprAff(r, c+r)]])
 G16_IRB2 = gen_irblock(LBL2, [[]])
 
-G16_IRA.blocks = {irb.label : irb for irb in [G16_IRB0, G16_IRB1]}
+G16_IRA.blocks = {irb.loc_key : irb for irb in [G16_IRB0, G16_IRB1]}
 
-G16_IRA.graph.add_uniq_edge(G16_IRB0.label, G16_IRB1.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB1.label, G16_IRB2.label)
+G16_IRA.graph.add_uniq_edge(G16_IRB0.loc_key, G16_IRB1.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB1.loc_key, G16_IRB2.loc_key)
 
-G16_IRA.blocks = {irb.label : irb for irb in [G16_IRB0, G16_IRB1]}
+G16_IRA.blocks = {irb.loc_key : irb for irb in [G16_IRB0, G16_IRB1]}
 
 # Expected output for graph 1
-G16_EXP_IRA = IRATest()
+G16_EXP_IRA = IRATest(symbol_pool)
 
 G16_EXP_IRB0 = gen_irblock(LBL0, [[ExprAff(c, CST3)], [ExprAff(a, c + CST1),
                                                        ExprAff(b, c + CST2)]])
 G16_EXP_IRB1 = gen_irblock(LBL1, [[ExprAff(r, a+b)], [ExprAff(r, c+r)]])
 
-G16_EXP_IRA.blocks = {irb.label: irb for irb in [G16_EXP_IRB0, G16_EXP_IRB1]}
+G16_EXP_IRA.blocks = {irb.loc_key: irb for irb in [G16_EXP_IRB0, G16_EXP_IRB1]}
 
 # graph 17 : parallel ir
 
-G17_IRA = IRATest()
+G17_IRA = IRATest(symbol_pool)
 
 G17_IRB0 = gen_irblock(LBL0, [[ExprAff(a, a*b),
                                ExprAff(b, c),
@@ -597,12 +599,12 @@ G17_IRB0 = gen_irblock(LBL0, [[ExprAff(a, a*b),
 
                          ])
 
-G17_IRA.blocks = {irb.label : irb for irb in [G17_IRB0]}
+G17_IRA.blocks = {irb.loc_key : irb for irb in [G17_IRB0]}
 
-G17_IRA.graph.add_node(G17_IRB0.label)
+G17_IRA.graph.add_node(G17_IRB0.loc_key)
 
 # Expected output for graph 17
-G17_EXP_IRA = IRATest()
+G17_EXP_IRA = IRATest(symbol_pool)
 
 G17_EXP_IRB0 = gen_irblock(LBL0, [[],
 
@@ -639,7 +641,7 @@ G17_EXP_IRB0 = gen_irblock(LBL0, [[],
                                   # Trick because a+b+c != ((a+b)+c)
                                  ])
 
-G17_EXP_IRA.blocks = {irb.label : irb for irb in [G17_EXP_IRB0]}
+G17_EXP_IRA.blocks = {irb.loc_key : irb for irb in [G17_EXP_IRB0]}
 
 # Begining  of tests
 
diff --git a/test/analysis/depgraph.py b/test/analysis/depgraph.py
index 9fb046d0..4e023761 100644
--- a/test/analysis/depgraph.py
+++ b/test/analysis/depgraph.py
@@ -1,6 +1,7 @@
 """Regression test module for DependencyGraph"""
-from miasm2.expression.expression import ExprId, ExprInt, ExprAff, ExprCond
-from miasm2.core.asmblock import AsmLabel
+from miasm2.expression.expression import ExprId, ExprInt, ExprAff, ExprCond, \
+    ExprLoc, LocKey
+from miasm2.core.asmblock import AsmSymbolPool
 from miasm2.ir.analysis import ira
 from miasm2.ir.ir import IRBlock, AssignBlock
 from miasm2.core.graph import DiGraph
@@ -9,6 +10,8 @@ from itertools import count
 from pdb import pm
 import re
 
+symbol_pool = AsmSymbolPool()
+
 EMULATION = True
 try:
     import z3
@@ -41,13 +44,13 @@ CST33 = ExprInt(0x33, 32)
 CST35 = ExprInt(0x35, 32)
 CST37 = ExprInt(0x37, 32)
 
-LBL0 = AsmLabel("lbl0")
-LBL1 = AsmLabel("lbl1")
-LBL2 = AsmLabel("lbl2")
-LBL3 = AsmLabel("lbl3")
-LBL4 = AsmLabel("lbl4")
-LBL5 = AsmLabel("lbl5")
-LBL6 = AsmLabel("lbl6")
+LBL0 = symbol_pool.add_location("lbl0", 0)
+LBL1 = symbol_pool.add_location("lbl1", 1)
+LBL2 = symbol_pool.add_location("lbl2", 2)
+LBL3 = symbol_pool.add_location("lbl3", 3)
+LBL4 = symbol_pool.add_location("lbl4", 4)
+LBL5 = symbol_pool.add_location("lbl5", 5)
+LBL6 = symbol_pool.add_location("lbl6", 6)
 
 def gen_irblock(label, exprs_list):
     """ Returns an IRBlock.
@@ -112,8 +115,8 @@ def bloc2graph(irgraph, label=False, lines=True):
     # Generate basic blocks
     out_blocks = []
     for label in irgraph.graph.nodes():
-        if isinstance(label, AsmLabel):
-            label_name = label.name
+        if isinstance(label, LocKey):
+            label_name = irgraph.symbol_pool.loc_key_to_name(label)
         else:
             label_name = str(label)
 
@@ -121,8 +124,8 @@ def bloc2graph(irgraph, label=False, lines=True):
             irblock = irgraph.blocks[label]
         else:
             irblock = None
-        if isinstance(label, AsmLabel):
-            out_block = '%s [\n' % label.name
+        if isinstance(label, LocKey):
+            out_block = '%s [\n' % label_name
         else:
             out_block = '%s [\n' % label
         out_block += "%s " % block_attr
@@ -152,12 +155,12 @@ def bloc2graph(irgraph, label=False, lines=True):
     out += out_blocks
     # Generate links
     for src, dst in irgraph.graph.edges():
-            if isinstance(src, AsmLabel):
-                src_name = src.name
+            if isinstance(src, LocKey):
+                src_name = irgraph.symbol_pool.loc_key_to_name(src)
             else:
                 src_name = str(src)
-            if isinstance(dst, AsmLabel):
-                dst_name = dst.name
+            if isinstance(dst, LocKey):
+                dst_name = irgraph.symbol_pool.loc_key_to_name(dst)
             else:
                 dst_name = str(dst)
 
@@ -184,19 +187,20 @@ def dg2graph(graph, label=False, lines=True):
 
     # Generate basic blocks
     out_blocks = []
-    for label in graph.nodes():
-        if isinstance(label, DependencyNode):
-            label_name = "%s %s %s" % (label.label.name,
-                                       label.element,
-                                       label.line_nb)
+    for node in graph.nodes():
+        if isinstance(node, DependencyNode):
+            name = symbol_pool.loc_key_to_name(node.loc_key)
+            node_name = "%s %s %s" % (name,
+                                       node.element,
+                                       node.line_nb)
         else:
-            label_name = str(label)
-        out_block = '%s [\n' % hash(label)
+            node_name = str(node)
+        out_block = '%s [\n' % hash(node)
         out_block += "%s " % block_attr
         out_block += 'label =<<table border="0" cellborder="0" cellpadding="3">'
 
         block_label = '<tr><td %s>%s</td></tr>' % (
-            label_attr, label_name)
+            label_attr, node_name)
         block_html_lines = []
         block_html_lines = ('<tr><td %s>' % td_attr +
                             ('</td></tr><tr><td %s>' % td_attr).join(block_html_lines) +
@@ -228,142 +232,142 @@ DNC3 = DependencyNode(LBL1, C, 0)
 
 # graph 1
 
-G1_IRA = IRATest()
+G1_IRA = IRATest(symbol_pool)
 
 G1_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G1_IRB1 = gen_irblock(LBL1, [[ExprAff(B, C)]])
 G1_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B)]])
 
-G1_IRA.graph.add_uniq_edge(G1_IRB0.label, G1_IRB1.label)
-G1_IRA.graph.add_uniq_edge(G1_IRB1.label, G1_IRB2.label)
+G1_IRA.graph.add_uniq_edge(G1_IRB0.loc_key, G1_IRB1.loc_key)
+G1_IRA.graph.add_uniq_edge(G1_IRB1.loc_key, G1_IRB2.loc_key)
 
-G1_IRA.blocks = dict([(irb.label, irb) for irb in [G1_IRB0, G1_IRB1, G1_IRB2]])
+G1_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G1_IRB0, G1_IRB1, G1_IRB2]])
 
 # graph 2
 
-G2_IRA = IRATest()
+G2_IRA = IRATest(symbol_pool)
 
 G2_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G2_IRB1 = gen_irblock(LBL1, [[ExprAff(B, CST2)]])
 G2_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B + C)]])
 
-G2_IRA.graph.add_uniq_edge(G2_IRB0.label, G2_IRB1.label)
-G2_IRA.graph.add_uniq_edge(G2_IRB1.label, G2_IRB2.label)
+G2_IRA.graph.add_uniq_edge(G2_IRB0.loc_key, G2_IRB1.loc_key)
+G2_IRA.graph.add_uniq_edge(G2_IRB1.loc_key, G2_IRB2.loc_key)
 
-G2_IRA.blocks = dict([(irb.label, irb) for irb in [G2_IRB0, G2_IRB1, G2_IRB2]])
+G2_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G2_IRB0, G2_IRB1, G2_IRB2]])
 
 
 # graph 3
 
-G3_IRA = IRATest()
+G3_IRA = IRATest(symbol_pool)
 
 G3_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G3_IRB1 = gen_irblock(LBL1, [[ExprAff(B, CST2)]])
 G3_IRB2 = gen_irblock(LBL2, [[ExprAff(B, CST3)]])
 G3_IRB3 = gen_irblock(LBL3, [[ExprAff(A, B + C)]])
 
-G3_IRA.graph.add_uniq_edge(G3_IRB0.label, G3_IRB1.label)
-G3_IRA.graph.add_uniq_edge(G3_IRB0.label, G3_IRB2.label)
-G3_IRA.graph.add_uniq_edge(G3_IRB1.label, G3_IRB3.label)
-G3_IRA.graph.add_uniq_edge(G3_IRB2.label, G3_IRB3.label)
+G3_IRA.graph.add_uniq_edge(G3_IRB0.loc_key, G3_IRB1.loc_key)
+G3_IRA.graph.add_uniq_edge(G3_IRB0.loc_key, G3_IRB2.loc_key)
+G3_IRA.graph.add_uniq_edge(G3_IRB1.loc_key, G3_IRB3.loc_key)
+G3_IRA.graph.add_uniq_edge(G3_IRB2.loc_key, G3_IRB3.loc_key)
 
-G3_IRA.blocks = dict([(irb.label, irb) for irb in [G3_IRB0, G3_IRB1,
+G3_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G3_IRB0, G3_IRB1,
                                                    G3_IRB2, G3_IRB3]])
 
 # graph 4
 
-G4_IRA = IRATest()
+G4_IRA = IRATest(symbol_pool)
 
 G4_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G4_IRB1 = gen_irblock(LBL1, [[ExprAff(C, C + CST2)],
                              [ExprAff(G4_IRA.IRDst,
-                                      ExprCond(C, ExprId(LBL2, 32),
-                                               ExprId(LBL1, 32)))]])
+                                      ExprCond(C, ExprLoc(LBL2, 32),
+                                               ExprLoc(LBL1, 32)))]])
 
 G4_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B)]])
 
-G4_IRA.graph.add_uniq_edge(G4_IRB0.label, G4_IRB1.label)
-G4_IRA.graph.add_uniq_edge(G4_IRB1.label, G4_IRB2.label)
-G4_IRA.graph.add_uniq_edge(G4_IRB1.label, G4_IRB1.label)
+G4_IRA.graph.add_uniq_edge(G4_IRB0.loc_key, G4_IRB1.loc_key)
+G4_IRA.graph.add_uniq_edge(G4_IRB1.loc_key, G4_IRB2.loc_key)
+G4_IRA.graph.add_uniq_edge(G4_IRB1.loc_key, G4_IRB1.loc_key)
 
-G4_IRA.blocks = dict([(irb.label, irb) for irb in [G4_IRB0, G4_IRB1, G4_IRB2]])
+G4_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G4_IRB0, G4_IRB1, G4_IRB2]])
 
 
 # graph 5
 
-G5_IRA = IRATest()
+G5_IRA = IRATest(symbol_pool)
 
 G5_IRB0 = gen_irblock(LBL0, [[ExprAff(B, CST1)]])
 G5_IRB1 = gen_irblock(LBL1, [[ExprAff(B, B + CST2)],
                              [ExprAff(G5_IRA.IRDst,
-                                      ExprCond(B, ExprId(LBL2, 32),
-                                               ExprId(LBL1, 32)))]])
+                                      ExprCond(B, ExprLoc(LBL2, 32),
+                                               ExprLoc(LBL1, 32)))]])
 
 G5_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B)]])
 
-G5_IRA.graph.add_uniq_edge(G5_IRB0.label, G5_IRB1.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB1.label, G5_IRB2.label)
-G5_IRA.graph.add_uniq_edge(G5_IRB1.label, G5_IRB1.label)
+G5_IRA.graph.add_uniq_edge(G5_IRB0.loc_key, G5_IRB1.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB1.loc_key, G5_IRB2.loc_key)
+G5_IRA.graph.add_uniq_edge(G5_IRB1.loc_key, G5_IRB1.loc_key)
 
-G5_IRA.blocks = dict([(irb.label, irb) for irb in [G5_IRB0, G5_IRB1, G5_IRB2]])
+G5_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G5_IRB0, G5_IRB1, G5_IRB2]])
 
 # graph 6
 
-G6_IRA = IRATest()
+G6_IRA = IRATest(symbol_pool)
 
 G6_IRB0 = gen_irblock(LBL0, [[ExprAff(B, CST1)]])
 G6_IRB1 = gen_irblock(LBL1, [[ExprAff(A, B)]])
 
-G6_IRA.graph.add_uniq_edge(G6_IRB0.label, G6_IRB1.label)
-G6_IRA.graph.add_uniq_edge(G6_IRB1.label, G6_IRB1.label)
+G6_IRA.graph.add_uniq_edge(G6_IRB0.loc_key, G6_IRB1.loc_key)
+G6_IRA.graph.add_uniq_edge(G6_IRB1.loc_key, G6_IRB1.loc_key)
 
-G6_IRA.blocks = dict([(irb.label, irb) for irb in [G6_IRB0, G6_IRB1]])
+G6_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G6_IRB0, G6_IRB1]])
 
 # graph 7
 
-G7_IRA = IRATest()
+G7_IRA = IRATest(symbol_pool)
 
 G7_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G7_IRB1 = gen_irblock(LBL1, [[ExprAff(B, C)], [ExprAff(A, B)]])
 G7_IRB2 = gen_irblock(LBL2, [[ExprAff(D, A)]])
 
-G7_IRA.graph.add_uniq_edge(G7_IRB0.label, G7_IRB1.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB1.label, G7_IRB1.label)
-G7_IRA.graph.add_uniq_edge(G7_IRB1.label, G7_IRB2.label)
+G7_IRA.graph.add_uniq_edge(G7_IRB0.loc_key, G7_IRB1.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB1.loc_key, G7_IRB1.loc_key)
+G7_IRA.graph.add_uniq_edge(G7_IRB1.loc_key, G7_IRB2.loc_key)
 
-G7_IRA.blocks = dict([(irb.label, irb) for irb in [G7_IRB0, G7_IRB1, G7_IRB2]])
+G7_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G7_IRB0, G7_IRB1, G7_IRB2]])
 
 # graph 8
 
-G8_IRA = IRATest()
+G8_IRA = IRATest(symbol_pool)
 
 G8_IRB0 = gen_irblock(LBL0, [[ExprAff(C, CST1)]])
 G8_IRB1 = gen_irblock(LBL1, [[ExprAff(B, C)], [ExprAff(C, D)]])
 G8_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B)]])
 
-G8_IRA.graph.add_uniq_edge(G8_IRB0.label, G8_IRB1.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB1.label, G8_IRB1.label)
-G8_IRA.graph.add_uniq_edge(G8_IRB1.label, G8_IRB2.label)
+G8_IRA.graph.add_uniq_edge(G8_IRB0.loc_key, G8_IRB1.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB1.loc_key, G8_IRB1.loc_key)
+G8_IRA.graph.add_uniq_edge(G8_IRB1.loc_key, G8_IRB2.loc_key)
 
-G8_IRA.blocks = dict([(irb.label, irb) for irb in [G8_IRB0, G8_IRB1, G8_IRB2]])
+G8_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G8_IRB0, G8_IRB1, G8_IRB2]])
 
 # graph 9 is graph 8
 
 # graph 10
 
-G10_IRA = IRATest()
+G10_IRA = IRATest(symbol_pool)
 
 G10_IRB1 = gen_irblock(LBL1, [[ExprAff(B, B + CST2)]])
 G10_IRB2 = gen_irblock(LBL2, [[ExprAff(A, B)]])
 
-G10_IRA.graph.add_uniq_edge(G10_IRB1.label, G10_IRB2.label)
-G10_IRA.graph.add_uniq_edge(G10_IRB1.label, G10_IRB1.label)
+G10_IRA.graph.add_uniq_edge(G10_IRB1.loc_key, G10_IRB2.loc_key)
+G10_IRA.graph.add_uniq_edge(G10_IRB1.loc_key, G10_IRB1.loc_key)
 
-G10_IRA.blocks = dict([(irb.label, irb) for irb in [G10_IRB1, G10_IRB2]])
+G10_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G10_IRB1, G10_IRB2]])
 
 # graph 11
 
-G11_IRA = IRATest()
+G11_IRA = IRATest(symbol_pool)
 
 G11_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1),
                                ExprAff(B, CST2)]])
@@ -371,89 +375,89 @@ G11_IRB1 = gen_irblock(LBL1, [[ExprAff(A, B),
                                ExprAff(B, A)]])
 G11_IRB2 = gen_irblock(LBL2, [[ExprAff(A, A - B)]])
 
-G11_IRA.graph.add_uniq_edge(G11_IRB0.label, G11_IRB1.label)
-G11_IRA.graph.add_uniq_edge(G11_IRB1.label, G11_IRB2.label)
+G11_IRA.graph.add_uniq_edge(G11_IRB0.loc_key, G11_IRB1.loc_key)
+G11_IRA.graph.add_uniq_edge(G11_IRB1.loc_key, G11_IRB2.loc_key)
 
-G11_IRA.blocks = dict([(irb.label, irb)
+G11_IRA.blocks = dict([(irb.loc_key, irb)
                        for irb in [G11_IRB0, G11_IRB1, G11_IRB2]])
 
 # graph 12
 
-G12_IRA = IRATest()
+G12_IRA = IRATest(symbol_pool)
 
 G12_IRB0 = gen_irblock(LBL0, [[ExprAff(B, CST1)]])
 G12_IRB1 = gen_irblock(LBL1, [[ExprAff(A, B)], [ExprAff(B, B + CST2)]])
 G12_IRB2 = gen_irblock(LBL2, [[ExprAff(B, A)]])
 
-G12_IRA.graph.add_uniq_edge(G12_IRB0.label, G12_IRB1.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB1.label, G12_IRB2.label)
-G12_IRA.graph.add_uniq_edge(G12_IRB1.label, G12_IRB1.label)
+G12_IRA.graph.add_uniq_edge(G12_IRB0.loc_key, G12_IRB1.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB1.loc_key, G12_IRB2.loc_key)
+G12_IRA.graph.add_uniq_edge(G12_IRB1.loc_key, G12_IRB1.loc_key)
 
-G12_IRA.blocks = dict([(irb.label, irb) for irb in [G12_IRB0, G12_IRB1,
+G12_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G12_IRB0, G12_IRB1,
                                                     G12_IRB2]])
 
 
 # graph 13
 
-G13_IRA = IRATest()
+G13_IRA = IRATest(symbol_pool)
 
 G13_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1)],
                               #[ExprAff(B, A)],
                               [ExprAff(G13_IRA.IRDst,
-                                       ExprId(LBL1, 32))]])
+                                       ExprLoc(LBL1, 32))]])
 G13_IRB1 = gen_irblock(LBL1, [[ExprAff(C, A)],
                               #[ExprAff(A, A + CST1)],
                               [ExprAff(G13_IRA.IRDst,
-                                       ExprCond(R, ExprId(LBL2, 32),
-                                                ExprId(LBL1, 32)))]])
+                                       ExprCond(R, ExprLoc(LBL2, 32),
+                                                ExprLoc(LBL1, 32)))]])
 
 G13_IRB2 = gen_irblock(LBL2, [[ExprAff(B, A + CST3)], [ExprAff(A, B + CST3)],
                               [ExprAff(G13_IRA.IRDst,
-                                       ExprId(LBL1, 32))]])
+                                       ExprLoc(LBL1, 32))]])
 
 G13_IRB3 = gen_irblock(LBL3, [[ExprAff(R, C)]])
 
-G13_IRA.graph.add_uniq_edge(G13_IRB0.label, G13_IRB1.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB1.label, G13_IRB2.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB2.label, G13_IRB1.label)
-G13_IRA.graph.add_uniq_edge(G13_IRB1.label, G13_IRB3.label)
+G13_IRA.graph.add_uniq_edge(G13_IRB0.loc_key, G13_IRB1.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB1.loc_key, G13_IRB2.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB2.loc_key, G13_IRB1.loc_key)
+G13_IRA.graph.add_uniq_edge(G13_IRB1.loc_key, G13_IRB3.loc_key)
 
-G13_IRA.blocks = dict([(irb.label, irb) for irb in [G13_IRB0, G13_IRB1,
+G13_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G13_IRB0, G13_IRB1,
                                                     G13_IRB2, G13_IRB3]])
 
 # graph 14
 
-G14_IRA = IRATest()
+G14_IRA = IRATest(symbol_pool)
 
 G14_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1)],
                               [ExprAff(G14_IRA.IRDst,
-                                       ExprId(LBL1, 32))]
+                                       ExprLoc(LBL1, 32))]
                              ])
 G14_IRB1 = gen_irblock(LBL1, [[ExprAff(B, A)],
                               [ExprAff(G14_IRA.IRDst,
-                                       ExprCond(C, ExprId(LBL2, 32),
-                                                ExprId(LBL3, 32)))]
+                                       ExprCond(C, ExprLoc(LBL2, 32),
+                                                ExprLoc(LBL3, 32)))]
                              ])
 
 G14_IRB2 = gen_irblock(LBL2, [[ExprAff(D, A)],
                               [ExprAff(A, D + CST1)],
                               [ExprAff(G14_IRA.IRDst,
-                                       ExprId(LBL1, 32))]
+                                       ExprLoc(LBL1, 32))]
                              ])
 
 G14_IRB3 = gen_irblock(LBL3, [[ExprAff(R, D + B)]])
 
-G14_IRA.graph.add_uniq_edge(G14_IRB0.label, G14_IRB1.label)
-G14_IRA.graph.add_uniq_edge(G14_IRB1.label, G14_IRB2.label)
-G14_IRA.graph.add_uniq_edge(G14_IRB2.label, G14_IRB1.label)
-G14_IRA.graph.add_uniq_edge(G14_IRB1.label, G14_IRB3.label)
+G14_IRA.graph.add_uniq_edge(G14_IRB0.loc_key, G14_IRB1.loc_key)
+G14_IRA.graph.add_uniq_edge(G14_IRB1.loc_key, G14_IRB2.loc_key)
+G14_IRA.graph.add_uniq_edge(G14_IRB2.loc_key, G14_IRB1.loc_key)
+G14_IRA.graph.add_uniq_edge(G14_IRB1.loc_key, G14_IRB3.loc_key)
 
-G14_IRA.blocks = dict([(irb.label, irb) for irb in [G14_IRB0, G14_IRB1,
+G14_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G14_IRB0, G14_IRB1,
                                                     G14_IRB2, G14_IRB3]])
 
 # graph 16
 
-G15_IRA = IRATest()
+G15_IRA = IRATest(symbol_pool)
 
 G15_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1)]])
 G15_IRB1 = gen_irblock(LBL1, [[ExprAff(D, A + B)],
@@ -461,16 +465,16 @@ G15_IRB1 = gen_irblock(LBL1, [[ExprAff(D, A + B)],
                               [ExprAff(B, C)]])
 G15_IRB2 = gen_irblock(LBL2, [[ExprAff(R, B)]])
 
-G15_IRA.graph.add_uniq_edge(G15_IRB0.label, G15_IRB1.label)
-G15_IRA.graph.add_uniq_edge(G15_IRB1.label, G15_IRB2.label)
-G15_IRA.graph.add_uniq_edge(G15_IRB1.label, G15_IRB1.label)
+G15_IRA.graph.add_uniq_edge(G15_IRB0.loc_key, G15_IRB1.loc_key)
+G15_IRA.graph.add_uniq_edge(G15_IRB1.loc_key, G15_IRB2.loc_key)
+G15_IRA.graph.add_uniq_edge(G15_IRB1.loc_key, G15_IRB1.loc_key)
 
-G15_IRA.blocks = dict([(irb.label, irb) for irb in [G15_IRB0, G15_IRB1,
+G15_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G15_IRB0, G15_IRB1,
                                                     G15_IRB2]])
 
 # graph 16
 
-G16_IRA = IRATest()
+G16_IRA = IRATest(symbol_pool)
 
 G16_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1)]])
 G16_IRB1 = gen_irblock(LBL1, [[ExprAff(R, D)]])
@@ -479,22 +483,22 @@ G16_IRB3 = gen_irblock(LBL3, [[ExprAff(R, D)]])
 G16_IRB4 = gen_irblock(LBL4, [[ExprAff(R, A)]])
 G16_IRB5 = gen_irblock(LBL5, [[ExprAff(R, A)]])
 
-G16_IRA.graph.add_uniq_edge(G16_IRB0.label, G16_IRB1.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB1.label, G16_IRB2.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB2.label, G16_IRB1.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB1.label, G16_IRB3.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB3.label, G16_IRB1.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB1.label, G16_IRB4.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB4.label, G16_IRB1.label)
-G16_IRA.graph.add_uniq_edge(G16_IRB1.label, G16_IRB5.label)
+G16_IRA.graph.add_uniq_edge(G16_IRB0.loc_key, G16_IRB1.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB1.loc_key, G16_IRB2.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB2.loc_key, G16_IRB1.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB1.loc_key, G16_IRB3.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB3.loc_key, G16_IRB1.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB1.loc_key, G16_IRB4.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB4.loc_key, G16_IRB1.loc_key)
+G16_IRA.graph.add_uniq_edge(G16_IRB1.loc_key, G16_IRB5.loc_key)
 
-G16_IRA.blocks = dict([(irb.label, irb) for irb in [G16_IRB0, G16_IRB1,
+G16_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G16_IRB0, G16_IRB1,
                                                     G16_IRB2, G16_IRB3,
                                                     G16_IRB4, G16_IRB5]])
 
 # graph 17
 
-G17_IRA = IRATest()
+G17_IRA = IRATest(symbol_pool)
 
 G17_IRB0 = gen_irblock(LBL0, [[ExprAff(A, CST1),
                                ExprAff(D, CST2)]])
@@ -502,94 +506,94 @@ G17_IRB1 = gen_irblock(LBL1, [[ExprAff(A, D),
                                ExprAff(B, D)]])
 G17_IRB2 = gen_irblock(LBL2, [[ExprAff(A, A - B)]])
 
-G17_IRA.graph.add_uniq_edge(G17_IRB0.label, G17_IRB1.label)
-G17_IRA.graph.add_uniq_edge(G17_IRB1.label, G17_IRB2.label)
+G17_IRA.graph.add_uniq_edge(G17_IRB0.loc_key, G17_IRB1.loc_key)
+G17_IRA.graph.add_uniq_edge(G17_IRB1.loc_key, G17_IRB2.loc_key)
 
-G17_IRA.blocks = dict([(irb.label, irb) for irb in [G17_IRB0, G17_IRB1,
+G17_IRA.blocks = dict([(irb.loc_key, irb) for irb in [G17_IRB0, G17_IRB1,
                                                     G17_IRB2]])
 
 # Test graph 1
 G1_TEST1_DN1 = DependencyNode(
-    G1_IRB2.label, A, len(G1_IRB2))
+    G1_IRB2.loc_key, A, len(G1_IRB2))
 
-G1_INPUT = (set([G1_TEST1_DN1]), set([G1_IRB0.label]))
+G1_INPUT = (set([G1_TEST1_DN1]), set([G1_IRB0.loc_key]))
 
 # Test graph 2
 
 G2_TEST1_DN1 = DependencyNode(
-    G2_IRB2.label, A, len(G2_IRB2))
+    G2_IRB2.loc_key, A, len(G2_IRB2))
 
-G2_INPUT = (set([G2_TEST1_DN1]), set([G2_IRB0.label]))
+G2_INPUT = (set([G2_TEST1_DN1]), set([G2_IRB0.loc_key]))
 
 # Test graph 3
 
 G3_TEST1_0_DN1 = DependencyNode(
-    G3_IRB3.label, A, len(G3_IRB3))
+    G3_IRB3.loc_key, A, len(G3_IRB3))
 
-G3_INPUT = (set([G3_TEST1_0_DN1]), set([G3_IRB0.label]))
+G3_INPUT = (set([G3_TEST1_0_DN1]), set([G3_IRB0.loc_key]))
 
 # Test graph 4
 
 G4_TEST1_DN1 = DependencyNode(
-    G4_IRB2.label, A, len(G2_IRB0))
+    G4_IRB2.loc_key, A, len(G2_IRB0))
 
-G4_INPUT = (set([G4_TEST1_DN1]), set([G4_IRB0.label]))
+G4_INPUT = (set([G4_TEST1_DN1]), set([G4_IRB0.loc_key]))
 
 # Test graph 5
 
 G5_TEST1_0_DN1 = DependencyNode(
-    G5_IRB2.label, A, len(G5_IRB2))
+    G5_IRB2.loc_key, A, len(G5_IRB2))
 
-G5_INPUT = (set([G5_TEST1_0_DN1]), set([G5_IRB0.label]))
+G5_INPUT = (set([G5_TEST1_0_DN1]), set([G5_IRB0.loc_key]))
 
 # Test graph 6
 
 G6_TEST1_0_DN1 = DependencyNode(
-    G6_IRB1.label, A, len(G6_IRB1))
+    G6_IRB1.loc_key, A, len(G6_IRB1))
 
-G6_INPUT = (set([G6_TEST1_0_DN1]), set([G6_IRB0.label]))
+G6_INPUT = (set([G6_TEST1_0_DN1]), set([G6_IRB0.loc_key]))
 
 # Test graph 7
 
 G7_TEST1_0_DN1 = DependencyNode(
-    G7_IRB2.label, D, len(G7_IRB2))
+    G7_IRB2.loc_key, D, len(G7_IRB2))
 
-G7_INPUT = (set([G7_TEST1_0_DN1]), set([G7_IRB0.label]))
+G7_INPUT = (set([G7_TEST1_0_DN1]), set([G7_IRB0.loc_key]))
 
 # Test graph 8
 
 G8_TEST1_0_DN1 = DependencyNode(
-    G8_IRB2.label, A, len(G8_IRB2))
+    G8_IRB2.loc_key, A, len(G8_IRB2))
 
-G8_INPUT = (set([G8_TEST1_0_DN1]), set([G3_IRB0.label]))
+G8_INPUT = (set([G8_TEST1_0_DN1]), set([G3_IRB0.loc_key]))
 
 # Test 9: Multi elements
 
 G9_TEST1_0_DN1 = DependencyNode(
-    G8_IRB2.label, A, len(G8_IRB2))
+    G8_IRB2.loc_key, A, len(G8_IRB2))
 G9_TEST1_0_DN5 = DependencyNode(
-    G8_IRB2.label, C, len(G8_IRB2))
+    G8_IRB2.loc_key, C, len(G8_IRB2))
 
-G9_INPUT = (set([G9_TEST1_0_DN1, G9_TEST1_0_DN5]), set([G8_IRB0.label]))
+G9_INPUT = (set([G9_TEST1_0_DN1, G9_TEST1_0_DN5]), set([G8_IRB0.loc_key]))
 
 # Test 10: loop at beginning
 
 G10_TEST1_0_DN1 = DependencyNode(
-    G10_IRB2.label, A, len(G10_IRB2))
+    G10_IRB2.loc_key, A, len(G10_IRB2))
 
-G10_INPUT = (set([G10_TEST1_0_DN1]), set([G10_IRB1.label]))
+G10_INPUT = (set([G10_TEST1_0_DN1]), set([G10_IRB1.loc_key]))
 
 
 # Test 11: no dual bloc emulation
 
 G11_TEST1_DN1 = DependencyNode(
-    G11_IRB2.label, A, len(G11_IRB2))
+    G11_IRB2.loc_key, A, len(G11_IRB2))
 
-G11_INPUT = (set([G11_TEST1_DN1]), set([G11_IRB0.label]))
+G11_INPUT = (set([G11_TEST1_DN1]), set([G11_IRB0.loc_key]))
 
 # Test graph 12
 
-G12_TEST1_0_DN1 = DependencyNode(G12_IRB2.label, B, 1)
+G12_TEST1_0_DN1 = DependencyNode(G12_IRB2.loc_key, B, 1)
 
 G12_INPUT = (set([G12_TEST1_0_DN1]), set([]))
 
@@ -597,7 +601,7 @@ G12_INPUT = (set([G12_TEST1_0_DN1]), set([]))
 
 # All filters
 
-G13_TEST1_0_DN4 = DependencyNode(G13_IRB3.label, R, 1)
+G13_TEST1_0_DN4 = DependencyNode(G13_IRB3.loc_key, R, 1)
 
 G13_INPUT = (set([G13_TEST1_0_DN4]), set([]))
 
@@ -605,24 +609,24 @@ G13_INPUT = (set([G13_TEST1_0_DN4]), set([]))
 
 # All filters
 
-G14_TEST1_0_DN1 = DependencyNode(G14_IRB3.label, R, 1)
+G14_TEST1_0_DN1 = DependencyNode(G14_IRB3.loc_key, R, 1)
 
 G14_INPUT = (set([G14_TEST1_0_DN1]), set([]))
 
 # Test graph 15
 
-G15_TEST1_0_DN1 = DependencyNode(G15_IRB2.label, R, 1)
+G15_TEST1_0_DN1 = DependencyNode(G15_IRB2.loc_key, R, 1)
 
 G15_INPUT = (set([G15_TEST1_0_DN1]), set([]))
 
 # Test graph 16
-G16_TEST1_0_DN1 = DependencyNode(G16_IRB5.label, R, 1)
+G16_TEST1_0_DN1 = DependencyNode(G16_IRB5.loc_key, R, 1)
 
 G16_INPUT = (set([G16_TEST1_0_DN1]), set([]))
 
 # Test graph 17
 
-G17_TEST1_DN1 = DependencyNode(G17_IRB2.label, A, 1)
+G17_TEST1_DN1 = DependencyNode(G17_IRB2.loc_key, A, 1)
 
 G17_INPUT = (set([G17_TEST1_DN1]), set([]))
 
@@ -638,7 +642,8 @@ def flatNode(node):
             element = int(node.element.arg)
         else:
             RuntimeError("Unsupported type '%s'" % type(enode.element))
-        return (node.label.name,
+        name = symbol_pool.loc_key_to_name(node.loc_key)
+        return (name,
                 element,
                 node.line_nb)
     else:
@@ -736,7 +741,8 @@ def match_results(resultsA, resultsB, nodes):
 def get_flat_init_depnodes(depnodes):
     out = []
     for node in depnodes:
-        out.append((node.label.name,
+        name = symbol_pool.loc_key_to_name(node.loc_key)
+        out.append((name,
                     node.element.name,
                     node.line_nb,
                     0))
diff --git a/test/arch/arm/sem.py b/test/arch/arm/sem.py
index d9e6aa76..05d26f5c 100755
--- a/test/arch/arm/sem.py
+++ b/test/arch/arm/sem.py
@@ -30,8 +30,8 @@ def compute(asm, inputstate={}, debug=False):
     code = mn.asm(instr)[0]
     instr = mn.dis(code, "l")
     instr.offset = inputstate.get(PC, 0)
-    interm.add_instr(instr)
-    symexec.run_at(instr.offset)
+    lbl = interm.add_instr(instr)
+    symexec.run_at(lbl)
     if debug:
         for k, v in symexec.symbols.items():
             if regs_init.get(k, None) != v:
diff --git a/test/arch/msp430/sem.py b/test/arch/msp430/sem.py
index 3b2c2f2e..6693a6f0 100755
--- a/test/arch/msp430/sem.py
+++ b/test/arch/msp430/sem.py
@@ -26,8 +26,8 @@ def compute(asm, inputstate={}, debug=False):
     code = mn.asm(instr)[0]
     instr = mn.dis(code, mode)
     instr.offset = inputstate.get(PC, 0)
-    interm.add_instr(instr)
-    symexec.run_at(instr.offset)
+    loc_key = interm.add_instr(instr)
+    symexec.run_at(loc_key)
     if debug:
         for k, v in symexec.symbols.items():
             if regs_init.get(k, None) != v:
diff --git a/test/arch/x86/sem.py b/test/arch/x86/sem.py
index b3b7e940..baa05341 100755
--- a/test/arch/x86/sem.py
+++ b/test/arch/x86/sem.py
@@ -25,11 +25,11 @@ symbol_pool = AsmSymbolPool()
 m32 = 32
 m64 = 64
 
-def symb_exec(interm, inputstate, debug):
+def symb_exec(lbl, interm, inputstate, debug):
     sympool = dict(regs_init)
     sympool.update(inputstate)
     symexec = SymbolicExecutionEngine(interm, sympool)
-    symexec.run_at(0)
+    symexec.run_at(lbl)
     if debug:
         for k, v in symexec.symbols.items():
             if regs_init.get(k, None) != v:
@@ -43,18 +43,19 @@ def compute(ir, mode, asm, inputstate={}, debug=False):
     instr = mn.dis(code, mode)
     instr.offset = inputstate.get(EIP, 0)
     interm = ir()
-    interm.add_instr(instr)
-    return symb_exec(interm, inputstate, debug)
+    lbl = interm.add_instr(instr)
+    return symb_exec(lbl, interm, inputstate, debug)
 
 
 def compute_txt(ir, mode, txt, inputstate={}, debug=False):
-    blocks, symbol_pool = parse_asm.parse_txt(mn, mode, txt)
+    asmcfg, symbol_pool = parse_asm.parse_txt(mn, mode, txt)
     symbol_pool.set_offset(symbol_pool.getby_name("main"), 0x0)
-    patches = asmblock.asm_resolve_final(mn, blocks, symbol_pool)
+    patches = asmblock.asm_resolve_final(mn, asmcfg, symbol_pool)
     interm = ir(symbol_pool)
-    for bbl in blocks:
+    lbl = symbol_pool.getby_name("main")
+    for bbl in asmcfg.blocks:
         interm.add_block(bbl)
-    return symb_exec(interm, inputstate, debug)
+    return symb_exec(lbl, interm, inputstate, debug)
 
 op_add = lambda a, b: a+b
 op_sub = lambda a, b: a-b
diff --git a/test/arch/x86/unit/mn_cdq.py b/test/arch/x86/unit/mn_cdq.py
index b6abc781..15b73913 100644
--- a/test/arch/x86/unit/mn_cdq.py
+++ b/test/arch/x86/unit/mn_cdq.py
@@ -10,7 +10,7 @@ class Test_CBW_16(Asm_Test_16):
     MYSTRING = "test CBW 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -31,7 +31,7 @@ class Test_CBW_16_signed(Asm_Test_16):
     MYSTRING = "test CBW 16 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654381
@@ -52,7 +52,7 @@ class Test_CBW_32(Asm_Test_32):
     MYSTRING = "test CBW 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -73,7 +73,7 @@ class Test_CBW_32_signed(Asm_Test_32):
     MYSTRING = "test CBW 32 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654381
@@ -94,7 +94,7 @@ class Test_CDQ_32(Asm_Test_32):
     MYSTRING = "test cdq 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x77654321
@@ -115,7 +115,7 @@ class Test_CDQ_32_signed(Asm_Test_32):
     MYSTRING = "test cdq 32 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -136,7 +136,7 @@ class Test_CDQ_64(Asm_Test_64):
     MYSTRING = "test cdq 64"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567877654321
@@ -157,7 +157,7 @@ class Test_CDQ_64_signed(Asm_Test_64):
     MYSTRING = "test cdq 64 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567887654321
@@ -178,7 +178,7 @@ class Test_CDQE_64(Asm_Test_64):
     MYSTRING = "test cdq 64"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567877654321
@@ -199,7 +199,7 @@ class Test_CDQE_64_signed(Asm_Test_64):
     MYSTRING = "test cdq 64 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567887654321
@@ -220,7 +220,7 @@ class Test_CWD_32(Asm_Test_32):
     MYSTRING = "test cdq 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -241,7 +241,7 @@ class Test_CWD_32_signed(Asm_Test_32):
     MYSTRING = "test cdq 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87658321
@@ -262,7 +262,7 @@ class Test_CWD_32(Asm_Test_32):
     MYSTRING = "test cdq 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -283,7 +283,7 @@ class Test_CWDE_32(Asm_Test_32):
     MYSTRING = "test cwde 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.EAX = 0x87654321
@@ -304,7 +304,7 @@ class Test_CWDE_32_signed(Asm_Test_32):
     MYSTRING = "test cwde 32 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x87658321
@@ -325,7 +325,7 @@ class Test_CWDE_64(Asm_Test_64):
     MYSTRING = "test cwde 64"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567887654321
@@ -346,7 +346,7 @@ class Test_CWDE_64_signed(Asm_Test_64):
     MYSTRING = "test cwde 64 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567887658321
@@ -367,7 +367,7 @@ class Test_CQO_64(Asm_Test_64):
     MYSTRING = "test cwde 64"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x1234567887654321
@@ -388,7 +388,7 @@ class Test_CQO_64_signed(Asm_Test_64):
     MYSTRING = "test cwde 64 signed"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.myjit.cpu.RAX = 0x8234567887658321
diff --git a/test/arch/x86/unit/mn_pushpop.py b/test/arch/x86/unit/mn_pushpop.py
index 7ac400c0..bed70ea3 100755
--- a/test/arch/x86/unit/mn_pushpop.py
+++ b/test/arch/x86/unit/mn_pushpop.py
@@ -21,7 +21,7 @@ class Test_PUSHAD_32(Asm_Test_32):
     MYSTRING = "test pushad 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -48,7 +48,7 @@ class Test_PUSHA_32(Asm_Test_32):
     MYSTRING = "test pusha 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -75,7 +75,7 @@ class Test_PUSHA_16(Asm_Test_16):
     MYSTRING = "test pusha 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -102,7 +102,7 @@ class Test_PUSHAD_16(Asm_Test_16):
     MYSTRING = "test pushad 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -129,7 +129,7 @@ class Test_PUSH_mode32_32(Asm_Test_32):
     MYSTRING = "test push mode32 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -152,7 +152,7 @@ class Test_PUSH_mode32_16(Asm_Test_32):
     MYSTRING = "test push mode32 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -175,7 +175,7 @@ class Test_PUSH_mode16_16(Asm_Test_16):
     MYSTRING = "test push mode16 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -198,7 +198,7 @@ class Test_PUSH_mode16_32(Asm_Test_16):
     MYSTRING = "test push mode16 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         init_regs(self)
@@ -221,7 +221,7 @@ class Test_POP_mode32_32(Asm_Test_32):
     MYSTRING = "test pop mode32 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.value = 0x11223344
@@ -243,7 +243,7 @@ class Test_POP_mode32_16(Asm_Test_32):
     MYSTRING = "test pop mode32 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.value = 0x1122
@@ -265,7 +265,7 @@ class Test_POP_mode16_16(Asm_Test_16):
     MYSTRING = "test pop mode16 16"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.value = 0x1122
@@ -287,7 +287,7 @@ class Test_POP_mode16_32(Asm_Test_16):
     MYSTRING = "test pop mode16 32"
 
     def prepare(self):
-        self.myjit.ir_arch.symbol_pool.add_label("lbl_ret", self.ret_addr)
+        self.myjit.ir_arch.symbol_pool.add_location("lbl_ret", self.ret_addr)
 
     def test_init(self):
         self.value = 0x11223344
diff --git a/test/arch/x86/unit/mn_strings.py b/test/arch/x86/unit/mn_strings.py
index 3cb70e2a..44da0a70 100755
--- a/test/arch/x86/unit/mn_strings.py
+++ b/test/arch/x86/unit/mn_strings.py
@@ -21,7 +21,8 @@ class Test_SCAS(Asm_Test_32):
 
     def check(self):
         assert(self.myjit.cpu.ECX == len(self.MYSTRING))
-        assert(self.myjit.cpu.EDI == self.myjit.ir_arch.symbol_pool.getby_name('mystr').offset + len(self.MYSTRING)+1)
+        mystr = self.myjit.ir_arch.symbol_pool.getby_name('mystr')
+        assert(self.myjit.cpu.EDI == self.myjit.ir_arch.symbol_pool.loc_key_to_offset(mystr) + len(self.MYSTRING)+1)
 
 
 class Test_MOVS(Asm_Test_32):
@@ -42,8 +43,10 @@ class Test_MOVS(Asm_Test_32):
 
     def check(self):
         assert(self.myjit.cpu.ECX == 0)
-        assert(self.myjit.cpu.EDI == self.myjit.ir_arch.symbol_pool.getby_name('buffer').offset + len(self.MYSTRING))
-        assert(self.myjit.cpu.ESI == self.myjit.ir_arch.symbol_pool.getby_name('mystr').offset + len(self.MYSTRING))
+        buffer = self.myjit.ir_arch.symbol_pool.getby_name('buffer')
+        assert(self.myjit.cpu.EDI == self.myjit.ir_arch.symbol_pool.loc_key_to_offset(buffer) + len(self.MYSTRING))
+        mystr = self.myjit.ir_arch.symbol_pool.getby_name('mystr')
+        assert(self.myjit.cpu.ESI == self.myjit.ir_arch.symbol_pool.loc_key_to_offset(mystr) + len(self.MYSTRING))
 
 
 if __name__ == "__main__":
diff --git a/test/core/asmblock.py b/test/core/asmblock.py
index 7f0dbc5f..c4a97518 100644
--- a/test/core/asmblock.py
+++ b/test/core/asmblock.py
@@ -3,7 +3,7 @@ from pdb import pm
 from miasm2.arch.x86.disasm import dis_x86_32
 from miasm2.analysis.binary import Container
 from miasm2.core.asmblock import AsmCFG, AsmConstraint, AsmBlock, \
-    AsmLabel, AsmBlockBad, AsmConstraintTo, AsmConstraintNext, \
+    AsmBlockBad, AsmConstraintTo, AsmConstraintNext, \
     bbl_simplifier
 from miasm2.core.graph import DiGraphSimplifier, MatchGraphJoker
 from miasm2.expression.expression import ExprId
@@ -19,57 +19,57 @@ first_block = mdis.dis_block(0)
 assert len(first_block.lines) == 5
 print first_block
 
-## Test redisassemble blocks
+## Test redisassemble asmcfg
 first_block_bis = mdis.dis_block(0)
 assert len(first_block.lines) == len(first_block_bis.lines)
 print first_block_bis
 
 ## Disassembly of several block, with cache
-blocks = mdis.dis_multiblock(0)
-assert len(blocks) == 17
+asmcfg = mdis.dis_multiblock(0)
+assert len(asmcfg) == 17
 
-## Test redisassemble blocks
-blocks = mdis.dis_multiblock(0)
-assert len(blocks) == 17
+## Test redisassemble asmcfg
+asmcfg = mdis.dis_multiblock(0)
+assert len(asmcfg) == 17
 ## Equality between assembly lines is not yet implemented
-assert len(blocks.heads()) == 1
-assert len(blocks.heads()[0].lines) == len(first_block.lines)
+assert len(asmcfg.heads()) == 1
+assert len(asmcfg.loc_key_to_block(asmcfg.heads()[0]).lines) == len(first_block.lines)
 
 # Test AsmCFG
-assert isinstance(blocks, AsmCFG)
-assert len(blocks.pendings) == 0
-assert len(blocks.nodes()) == 17
-assert len(blocks.edges2constraint) == len(blocks.edges())
-assert len(blocks.edges()) == 24
-assert blocks.getby_offset(0x63).lines[0].offset == 0x5f
-assert blocks.getby_offset(0x69).lines[0].offset == 0x69
+assert isinstance(asmcfg, AsmCFG)
+assert len(asmcfg.pendings) == 0
+assert len(asmcfg.nodes()) == 17
+assert len(asmcfg.edges2constraint) == len(asmcfg.edges())
+assert len(asmcfg.edges()) == 24
+assert asmcfg.getby_offset(0x63).lines[0].offset == 0x5f
+assert asmcfg.getby_offset(0x69).lines[0].offset == 0x69
 
 ## Convert to dot
-open("graph.dot", "w").write(blocks.dot())
+open("graph.dot", "w").write(asmcfg.dot())
 
 ## Modify the structure: link the first and the last block
-leaves = blocks.leaves()
+leaves = asmcfg.leaves()
 assert len(leaves) == 1
-last_block = leaves.pop()
+last_block_loc_key = leaves.pop()
 
 ### Remove first_block for the rest of the graph
-first_block = blocks.heads()[0]
+first_block = asmcfg.loc_key_to_block(asmcfg.heads()[0])
 assert len(first_block.bto) == 2
-for succ in blocks.successors(first_block):
-    blocks.del_edge(first_block, succ)
+for succ in asmcfg.successors(first_block.loc_key):
+    asmcfg.del_edge(first_block.loc_key, succ)
 
 ### Modification must be reported from the graph
 assert len(first_block.bto) == 0
-assert last_block in blocks
+assert last_block_loc_key in asmcfg.nodes()
 
 ### Remove predecessors of last block
-for pred in blocks.predecessors(last_block):
-    blocks.del_edge(pred, last_block)
+for pred in asmcfg.predecessors(last_block_loc_key):
+    asmcfg.del_edge(pred, last_block_loc_key)
 ### Link first and last block
-blocks.add_edge(first_block, last_block, AsmConstraint.c_next)
-### Only one link between two blocks
+asmcfg.add_edge(first_block.loc_key, last_block_loc_key, AsmConstraint.c_next)
+### Only one link between two asmcfg
 try:
-    blocks.add_edge(first_block, last_block, AsmConstraint.c_to)
+    asmcfg.add_edge(first_block, last_block_loc_key, AsmConstraint.c_to)
     good = False
 except AssertionError:
     good = True
@@ -79,222 +79,233 @@ assert good
 assert len(first_block.bto) == 1
 assert list(first_block.bto)[0].c_t == AsmConstraint.c_next
 
-## Simplify the obtained graph to keep only blocks which reach a block
+## Simplify the obtained graph to keep only asmcfg which reach a block
 ## finishing with RET
 
 def remove_useless_blocks(d_g, graph):
     """Remove leaves without a RET"""
-    for block in graph.leaves():
+    for leaf_label in graph.leaves():
+        block = graph.loc_key_to_block(leaf_label)
         if block.lines[-1].name != "RET":
-            graph.del_node(block)
+            graph.del_block(graph.loc_key_to_block(leaf_label))
 
 ### Use a graph simplifier to recursively apply the simplification pass
 dg = DiGraphSimplifier()
 dg.enable_passes([remove_useless_blocks])
-blocks = dg(blocks)
+asmcfg = dg(asmcfg)
 
-### Only two blocks should remain
-assert len(blocks) == 2
-assert first_block in blocks
-assert last_block in blocks
+### Only two asmcfg should remain
+assert len(asmcfg) == 2
+assert first_block.loc_key in asmcfg.nodes()
+assert last_block_loc_key in asmcfg.nodes()
 
 ## Graph the final output
-open("graph2.dot", "w").write(blocks.dot())
+open("graph2.dot", "w").write(asmcfg.dot())
 
 # Test helper methods
-## Label2block should always be updated
-assert blocks.label2block(first_block.label) == first_block
-my_block = AsmBlock(AsmLabel("testlabel"))
-blocks.add_node(my_block)
-assert len(blocks) == 3
-assert blocks.label2block(first_block.label) == first_block
-assert blocks.label2block(my_block.label) == my_block
+## loc_key_to_block should always be updated
+assert asmcfg.loc_key_to_block(first_block.loc_key) == first_block
+testlabel = mdis.symbol_pool.getby_name_create("testlabel")
+my_block = AsmBlock(testlabel)
+asmcfg.add_block(my_block)
+assert len(asmcfg) == 3
+assert asmcfg.loc_key_to_block(first_block.loc_key) == first_block
+assert asmcfg.loc_key_to_block(my_block.loc_key) == my_block
 
-## Bad blocks
-assert len(list(blocks.get_bad_blocks())) == 0
-assert len(list(blocks.get_bad_blocks_predecessors())) == 0
+## Bad asmcfg
+assert len(list(asmcfg.get_bad_blocks())) == 0
+assert len(list(asmcfg.get_bad_blocks_predecessors())) == 0
 ### Add a bad block, not linked
-my_bad_block = AsmBlockBad(AsmLabel("testlabel_bad"))
-blocks.add_node(my_bad_block)
-assert list(blocks.get_bad_blocks()) == [my_bad_block]
-assert len(list(blocks.get_bad_blocks_predecessors())) == 0
+testlabel_bad = mdis.symbol_pool.getby_name_create("testlabel_bad")
+my_bad_block = AsmBlockBad(testlabel_bad)
+asmcfg.add_block(my_bad_block)
+assert list(asmcfg.get_bad_blocks()) == [my_bad_block]
+assert len(list(asmcfg.get_bad_blocks_predecessors())) == 0
 ### Link the bad block and update edges
-### Indeed, a sub-element has been modified (bto from a block from blocks)
-my_block.bto.add(AsmConstraintTo(my_bad_block.label))
-blocks.rebuild_edges()
-assert list(blocks.get_bad_blocks_predecessors()) == [my_block]
+### Indeed, a sub-element has been modified (bto from a block from asmcfg)
+my_block.bto.add(AsmConstraintTo(my_bad_block.loc_key))
+asmcfg.rebuild_edges()
+assert list(asmcfg.get_bad_blocks_predecessors()) == [my_block.loc_key]
 ### Test strict option
-my_block.bto.add(AsmConstraintTo(my_block.label))
-blocks.rebuild_edges()
-assert list(blocks.get_bad_blocks_predecessors(strict=False)) == [my_block]
-assert len(list(blocks.get_bad_blocks_predecessors(strict=True))) == 0
+my_block.bto.add(AsmConstraintTo(my_block.loc_key))
+asmcfg.rebuild_edges()
+assert list(asmcfg.get_bad_blocks_predecessors(strict=False)) == [my_block.loc_key]
+assert len(list(asmcfg.get_bad_blocks_predecessors(strict=True))) == 0
 
 ## Sanity check
-blocks.sanity_check()
+asmcfg.sanity_check()
 ### Next on itself
-my_block_ni = AsmBlock(AsmLabel("testlabel_nextitself"))
-my_block_ni.bto.add(AsmConstraintNext(my_block_ni.label))
-blocks.add_node(my_block_ni)
+testlabel_nextitself = mdis.symbol_pool.getby_name_create("testlabel_nextitself")
+my_block_ni = AsmBlock(testlabel_nextitself)
+my_block_ni.bto.add(AsmConstraintNext(my_block_ni.loc_key))
+asmcfg.add_block(my_block_ni)
 error_raised = False
 try:
-    blocks.sanity_check()
+    asmcfg.sanity_check()
 except RuntimeError:
     error_raised = True
 assert error_raised
 ### Back to a normal state
-blocks.del_node(my_block_ni)
-blocks.sanity_check()
+asmcfg.del_block(my_block_ni)
+asmcfg.sanity_check()
 ### Multiple next on the same node
-my_block_target = AsmBlock(AsmLabel("testlabel_target"))
-blocks.add_node(my_block_target)
-my_block_src1 = AsmBlock(AsmLabel("testlabel_src1"))
-my_block_src2 = AsmBlock(AsmLabel("testlabel_src2"))
-my_block_src1.bto.add(AsmConstraintNext(my_block_target.label))
-blocks.add_node(my_block_src1)
+testlabel_target = mdis.symbol_pool.getby_name_create("testlabel_target")
+my_block_target = AsmBlock(testlabel_target)
+asmcfg.add_block(my_block_target)
+testlabel_src1 = mdis.symbol_pool.getby_name_create("testlabel_src1")
+testlabel_src2 = mdis.symbol_pool.getby_name_create("testlabel_src2")
+my_block_src1 = AsmBlock(testlabel_src1)
+my_block_src2 = AsmBlock(testlabel_src2)
+my_block_src1.bto.add(AsmConstraintNext(my_block_target.loc_key))
+asmcfg.add_block(my_block_src1)
 ### OK for now
-blocks.sanity_check()
+asmcfg.sanity_check()
 ### Add a second next from src2 to target (already src1 -> target)
-my_block_src2.bto.add(AsmConstraintNext(my_block_target.label))
-blocks.add_node(my_block_src2)
+my_block_src2.bto.add(AsmConstraintNext(my_block_target.loc_key))
+asmcfg.add_block(my_block_src2)
 error_raised = False
 try:
-    blocks.sanity_check()
+    asmcfg.sanity_check()
 except RuntimeError:
     error_raised = True
 assert error_raised
-blocks.del_node(my_block_src2)
-blocks.sanity_check()
+asmcfg.del_block(my_block_src2)
+asmcfg.sanity_check()
 
 ## Guess block size
 ### Initial state
 assert not hasattr(first_block, 'size')
 assert not hasattr(first_block, 'max_size')
-blocks.guess_blocks_size(mdis.arch)
+asmcfg.guess_blocks_size(mdis.arch)
 assert first_block.size == 39
-assert blocks.label2block(my_block_src1.label).size == 0
+assert asmcfg.loc_key_to_block(my_block_src1.loc_key).size == 0
 assert first_block.max_size == 39
-assert blocks.label2block(my_block_src1.label).max_size == 0
+assert asmcfg.loc_key_to_block(my_block_src1.loc_key).max_size == 0
 
 ## Check pendings
 ### Create a pending element
-my_block_src = AsmBlock(AsmLabel("testlabel_pend_src"))
-my_block_dst = AsmBlock(AsmLabel("testlabel_pend_dst"))
-my_block_src.bto.add(AsmConstraintTo(my_block_dst.label))
-blocks.add_node(my_block_src)
+testlabel_pend_src = mdis.symbol_pool.getby_name_create("testlabel_pend_src")
+testlabel_pend_dst = mdis.symbol_pool.getby_name_create("testlabel_pend_dst")
+my_block_src = AsmBlock(testlabel_pend_src)
+my_block_dst = AsmBlock(testlabel_pend_dst)
+my_block_src.bto.add(AsmConstraintTo(my_block_dst.loc_key))
+asmcfg.add_block(my_block_src)
 ### Check resulting state
-assert len(blocks) == 7
-assert len(blocks.pendings) == 1
-assert my_block_dst.label in blocks.pendings
-assert len(blocks.pendings[my_block_dst.label]) == 1
-pending = list(blocks.pendings[my_block_dst.label])[0]
-assert isinstance(pending, blocks.AsmCFGPending)
+assert len(asmcfg) == 7
+assert len(asmcfg.pendings) == 1
+assert my_block_dst.loc_key in asmcfg.pendings
+assert len(asmcfg.pendings[my_block_dst.loc_key]) == 1
+pending = list(asmcfg.pendings[my_block_dst.loc_key])[0]
+assert isinstance(pending, asmcfg.AsmCFGPending)
 assert pending.waiter == my_block_src
 assert pending.constraint == AsmConstraint.c_to
 ### Sanity check must fail
 error_raised = False
 try:
-    blocks.sanity_check()
+    asmcfg.sanity_check()
 except RuntimeError:
     error_raised = True
 assert error_raised
 ### Pending must disappeared when adding expected block
-blocks.add_node(my_block_dst)
-assert len(blocks) == 8
-assert len(blocks.pendings) == 0
-blocks.sanity_check()
+asmcfg.add_block(my_block_dst)
+assert len(asmcfg) == 8
+assert len(asmcfg.pendings) == 0
+asmcfg.sanity_check()
 
 # Test block_merge
 data2 = "31c0eb0c31c9750c31d2eb0c31ffebf831dbebf031edebfc31f6ebf031e4c3".decode("hex")
 cont2 = Container.from_string(data2)
 mdis = dis_x86_32(cont2.bin_stream)
 ## Elements to merge
-blocks = mdis.dis_multiblock(0)
+asmcfg = mdis.dis_multiblock(0)
 ## Block alone
-blocks.add_node(mdis.dis_block(0x1c))
+asmcfg.add_block(mdis.dis_block(0x1c))
 ## Bad block
-blocks.add_node(mdis.dis_block(len(data2)))
+asmcfg.add_block(mdis.dis_block(len(data2)))
 ## Dump the graph before merging
-open("graph3.dot", "w").write(blocks.dot())
+open("graph3.dot", "w").write(asmcfg.dot())
 ## Apply merging
-blocks = bbl_simplifier(blocks)
+asmcfg = bbl_simplifier(asmcfg)
 ## Dump the graph after merging
-open("graph4.dot", "w").write(blocks.dot())
+open("graph4.dot", "w").write(asmcfg.dot())
 ## Check the final state
-assert len(blocks) == 5
-assert len(list(blocks.get_bad_blocks())) == 1
-### Check "special" blocks
-entry_blocks = blocks.heads()
-bad_block = (block for block in entry_blocks
-             if isinstance(block, AsmBlockBad)).next()
-entry_blocks.remove(bad_block)
-alone_block = (block for block in entry_blocks
-               if len(blocks.successors(block)) == 0).next()
-entry_blocks.remove(alone_block)
+assert len(asmcfg) == 5
+assert len(list(asmcfg.get_bad_blocks())) == 1
+### Check "special" asmcfg
+entry_asmcfg = asmcfg.heads()
+bad_block_lbl = (lbl for lbl in entry_asmcfg
+                 if isinstance(asmcfg.loc_key_to_block(lbl), AsmBlockBad)).next()
+entry_asmcfg.remove(bad_block_lbl)
+alone_block = (asmcfg.loc_key_to_block(lbl) for lbl in entry_asmcfg
+               if len(asmcfg.successors(lbl)) == 0).next()
+entry_asmcfg.remove(alone_block.loc_key)
 assert alone_block.lines[-1].name == "RET"
 assert len(alone_block.lines) == 2
 ### Check resulting function
-entry_block = entry_blocks.pop()
+entry_block = asmcfg.loc_key_to_block(entry_asmcfg.pop())
 assert len(entry_block.lines) == 4
 assert map(str, entry_block.lines) == ['XOR        EAX, EAX',
                                        'XOR        EBX, EBX',
                                        'XOR        ECX, ECX',
-                                       'JNZ        loc_0000000000000014:0x00000014']
-assert len(blocks.successors(entry_block)) == 2
+                                       'JNZ        label_3']
+assert len(asmcfg.successors(entry_block.loc_key)) == 2
 assert len(entry_block.bto) == 2
-nextb = blocks.label2block((cons.label for cons in entry_block.bto
-                            if cons.c_t == AsmConstraint.c_next).next())
-tob = blocks.label2block((cons.label for cons in entry_block.bto
-                          if cons.c_t == AsmConstraint.c_to).next())
+nextb = asmcfg.loc_key_to_block((cons.loc_key for cons in entry_block.bto
+                              if cons.c_t == AsmConstraint.c_next).next())
+tob = asmcfg.loc_key_to_block((cons.loc_key for cons in entry_block.bto
+                            if cons.c_t == AsmConstraint.c_to).next())
 assert len(nextb.lines) == 4
 assert map(str, nextb.lines) == ['XOR        EDX, EDX',
                                  'XOR        ESI, ESI',
                                  'XOR        EDI, EDI',
-                                 'JMP        loc_0000000000000008:0x00000008']
-assert blocks.successors(nextb) == [nextb]
+                                 'JMP        label_4']
+assert asmcfg.successors(nextb.loc_key) == [nextb.loc_key]
 assert len(tob.lines) == 2
 assert map(str, tob.lines) == ['XOR        EBP, EBP',
-                               'JMP        loc_0000000000000014:0x00000014']
-assert blocks.successors(tob) == [tob]
+                               'JMP        label_3']
+assert asmcfg.successors(tob.loc_key) == [tob.loc_key]
 
 # Check split_block
 ## Without condition for a split, no change
-blocks_bef = blocks.copy()
-blocks.apply_splitting(mdis.symbol_pool)
-assert blocks_bef == blocks
+asmcfg_bef = asmcfg.copy()
+asmcfg.apply_splitting(mdis.symbol_pool)
+assert asmcfg_bef == asmcfg
+open("graph5.dot", "w").write(asmcfg.dot())
 ## Create conditions for a block split
 inside_firstbbl = mdis.symbol_pool.getby_offset(4)
 tob.bto.add(AsmConstraintTo(inside_firstbbl))
-blocks.rebuild_edges()
-assert len(blocks.pendings) == 1
-assert inside_firstbbl in blocks.pendings
-blocks.apply_splitting(mdis.symbol_pool)
+asmcfg.rebuild_edges()
+assert len(asmcfg.pendings) == 1
+assert inside_firstbbl in asmcfg.pendings
+asmcfg.apply_splitting(mdis.symbol_pool)
 ## Check result
-assert len(blocks) == 6
-assert len(blocks.pendings) == 0
+assert len(asmcfg) == 6
+assert len(asmcfg.pendings) == 0
 assert len(entry_block.lines) == 2
 assert map(str, entry_block.lines) == ['XOR        EAX, EAX',
                                        'XOR        EBX, EBX']
-assert len(blocks.successors(entry_block)) == 1
-newb = blocks.successors(entry_block)[0]
+assert len(asmcfg.successors(entry_block.loc_key)) == 1
+lbl_newb = asmcfg.successors(entry_block.loc_key)[0]
+newb = asmcfg.loc_key_to_block(lbl_newb)
 assert len(newb.lines) == 2
 assert map(str, newb.lines) == ['XOR        ECX, ECX',
-                                'JNZ        loc_0000000000000014:0x00000014']
-preds = blocks.predecessors(newb)
+                                'JNZ        label_3']
+preds = asmcfg.predecessors(lbl_newb)
 assert len(preds) == 2
-assert entry_block in preds
-assert tob in preds
-assert blocks.edges2constraint[(entry_block, newb)] == AsmConstraint.c_next
-assert blocks.edges2constraint[(tob, newb)] == AsmConstraint.c_to
+assert entry_block.loc_key in preds
+assert tob.loc_key in preds
+assert asmcfg.edges2constraint[(entry_block.loc_key, lbl_newb)] == AsmConstraint.c_next
+assert asmcfg.edges2constraint[(tob.loc_key, lbl_newb)] == AsmConstraint.c_to
 
 
 # Check double block split
 data = "74097405b8020000007405b803000000b804000000c3".decode('hex')
 cont = Container.from_string(data)
 mdis = dis_x86_32(cont.bin_stream)
-blocks = mdis.dis_multiblock(0)
+asmcfg = mdis.dis_multiblock(0)
 ## Check resulting disasm
-assert len(blocks.nodes()) == 6
-blocks.sanity_check()
+assert len(asmcfg.nodes()) == 6
+asmcfg.sanity_check()
 ## Check graph structure
 bbl0 = MatchGraphJoker(name="0")
 bbl2 = MatchGraphJoker(name="2")
@@ -307,8 +318,18 @@ matcher = bbl0 >> bbl2 >> bbl4 >> bbl9 >> bblB >> bbl10
 matcher += bbl2 >> bbl9 >> bbl10
 matcher += bbl0 >> bblB
 
-solutions = list(matcher.match(blocks))
+solutions = list(matcher.match(asmcfg))
 assert len(solutions) == 1
 solution = solutions.pop()
-for jbbl, block in solution.iteritems():
-    assert block.label.offset == int(jbbl._name, 16)
+for jbbl, label in solution.iteritems():
+    offset = mdis.symbol_pool.loc_key_to_offset(label)
+    assert offset == int(jbbl._name, 16)
+
+loc_key_dum = mdis.symbol_pool.getby_name_create("dummy_loc")
+asmcfg.add_node(loc_key_dum)
+error_raised = False
+try:
+    asmcfg.sanity_check()
+except RuntimeError:
+    error_raised = True
+assert error_raised
diff --git a/test/core/graph.py b/test/core/graph.py
index 9f8afcae..b71c3d51 100644
--- a/test/core/graph.py
+++ b/test/core/graph.py
@@ -257,7 +257,7 @@ assert len([sol for sol in sols if sol[j1] == 1]) == 1
 assert len([sol for sol in sols if sol[j1] == 2]) == 1
 
 ## Check filter
-j2 = MatchGraphJoker(name="son", restrict_out=False, filt=lambda node: node < 2)
+j2 = MatchGraphJoker(name="son", restrict_out=False, filt=lambda graph, node: node < 2)
 matcher = j1 >> j2 >> j1
 sols = list(matcher.match(graph))
 assert len(sols) == 1
diff --git a/test/core/parse_asm.py b/test/core/parse_asm.py
index 54f3be1d..fab3a815 100755
--- a/test/core/parse_asm.py
+++ b/test/core/parse_asm.py
@@ -64,18 +64,19 @@ class TestParseAsm(unittest.TestCase):
         .string "toto"
         '''
 
-        blocks, symbol_pool = parse_txt(mn_x86, 32, ASM0)
+        asmcfg, symbol_pool = parse_txt(mn_x86, 32, ASM0)
         patches = asm_resolve_final(mn_x86,
-                                    blocks,
+                                    asmcfg,
                                     symbol_pool)
         lbls = []
         for i in xrange(6):
             lbls.append(symbol_pool.getby_name('lbl%d' % i))
         # align test
-        assert(lbls[5].offset % 0x10 == 0)
+        offset = symbol_pool.loc_key_to_offset(lbls[5])
+        assert(offset % 0x10 == 0)
         lbl2block = {}
-        for block in blocks:
-            lbl2block[block.label] = block
+        for block in asmcfg.blocks:
+            lbl2block[block.loc_key] = block
         # dontsplit test
         assert(lbls[2] == lbl2block[lbls[1]].get_next())
         assert(lbls[3] == lbl2block[lbls[2]].get_next())
@@ -94,13 +95,13 @@ class TestParseAsm(unittest.TestCase):
             RET
         '''
 
-        blocks, symbol_pool = parse_txt(mn_x86, 32, ASM0)
+        asmcfg, symbol_pool = parse_txt(mn_x86, 32, ASM0)
         lbls = []
         for i in xrange(2):
             lbls.append(symbol_pool.getby_name('lbl%d' % i))
         lbl2block = {}
-        for block in blocks:
-            lbl2block[block.label] = block
+        for block in asmcfg.blocks:
+            lbl2block[block.loc_key] = block
         # split test
         assert(lbl2block[lbls[1]].get_next() is None)
 
diff --git a/test/core/sembuilder.py b/test/core/sembuilder.py
index ebf9f385..53aa199d 100644
--- a/test/core/sembuilder.py
+++ b/test/core/sembuilder.py
@@ -2,22 +2,23 @@ import inspect
 from pdb import pm
 
 from miasm2.core.sembuilder import SemBuilder
+from miasm2.core.asmblock import AsmSymbolPool
 import miasm2.expression.expression as m2_expr
-from miasm2.core.asmblock import AsmLabel
+
+
 
 # Test classes
 class IR(object):
+    def __init__(self, symbol_pool):
+        self.symbol_pool = symbol_pool
 
     IRDst = m2_expr.ExprId("IRDst", 32)
 
     def get_next_instr(self, _):
-        return AsmLabel("NEXT")
-
-    def get_next_label(self, _):
-        return AsmLabel("NEXT")
+        return m2_expr.LocKey(0)
 
-    def gen_label(self):
-        return AsmLabel("GEN")
+    def get_next_loc_key(self, _):
+        return m2_expr.LocKey(0)
 
 class Instr(object):
     mode = 32
@@ -44,7 +45,8 @@ def test(Arg1, Arg2, Arg3):
 a = m2_expr.ExprId('A', 32)
 b = m2_expr.ExprId('B', 32)
 c = m2_expr.ExprId('C', 32)
-ir = IR()
+symbol_pool = AsmSymbolPool()
+ir = IR(symbol_pool)
 instr = Instr()
 res = test(ir, instr, a, b, c)
 
@@ -58,7 +60,7 @@ for statement in res[0]:
 
 print "[+] Blocks:"
 for irb in res[1]:
-    print irb.label
+    print irb.loc_key
     for assignblk in irb:
         for expr in assignblk:
             print expr
diff --git a/test/expression/parser.py b/test/expression/parser.py
index 9c01c8a1..1d5889fb 100644
--- a/test/expression/parser.py
+++ b/test/expression/parser.py
@@ -1,9 +1,10 @@
 from miasm2.expression.parser import str_to_expr
 from miasm2.expression.expression import ExprInt, ExprId, ExprSlice, ExprMem, \
-    ExprCond, ExprCompose, ExprOp, ExprAff
+    ExprCond, ExprCompose, ExprOp, ExprAff, ExprLoc, LocKey
 
 for expr_test in [ExprInt(0x12, 32),
                   ExprId('test', 32),
+                  ExprLoc(LocKey(12), 32),
                   ExprSlice(ExprInt(0x10, 32), 0, 8),
                   ExprMem(ExprInt(0x10, 32), 32),
                   ExprCond(ExprInt(0x10, 32), ExprInt(0x11, 32), ExprInt(0x12, 32)),
diff --git a/test/ir/translators/z3_ir.py b/test/ir/translators/z3_ir.py
index 6ae2dcd0..29b3c39d 100644
--- a/test/ir/translators/z3_ir.py
+++ b/test/ir/translators/z3_ir.py
@@ -1,12 +1,16 @@
 import z3
 
-from miasm2.core.asmblock import AsmLabel
+from miasm2.core.asmblock import AsmSymbolPool
 from miasm2.expression.expression import *
-from miasm2.ir.translators.translator import Translator
-from miasm2.ir.translators.z3_ir import Z3Mem
+from miasm2.ir.translators.z3_ir import Z3Mem, TranslatorZ3
 
 # Some examples of use/unit tests.
 
+symbol_pool = AsmSymbolPool()
+translator1 = TranslatorZ3(endianness="<", symbol_pool=symbol_pool)
+translator2 = TranslatorZ3(endianness=">", symbol_pool=symbol_pool)
+
+
 def equiv(z3_expr1, z3_expr2):
     s = z3.Solver()
     s.add(z3.Not(z3_expr1 == z3_expr2))
@@ -34,17 +38,17 @@ assert equiv(z3.BitVec('a', 32) + z3.BitVecVal(3, 32) - z3.BitVecVal(1, 32),
 
 # Z3Mem short tests
 # --------------------------------------------------------------------------
-mem = Z3Mem(endianness='<') # little endian  
+mem = Z3Mem(endianness='<') # little endian
 eax = z3.BitVec('EAX', 32)
 assert equiv(
          # @32[EAX]
          mem.get(eax, 32),
          # @16[EAX+2] . @16[EAX]
-         z3.Concat(mem.get(eax+2, 16), 
+         z3.Concat(mem.get(eax+2, 16),
                    mem.get(eax, 16)))
 
 # --------------------------------------------------------------------------
-ax = z3.BitVec('AX', 16) 
+ax = z3.BitVec('AX', 16)
 assert not equiv(
         # @16[EAX] with EAX = ZeroExtend(AX)
         mem.get(z3.ZeroExt(16, ax), 16),
@@ -54,7 +58,7 @@ assert not equiv(
 # TranslatorZ3 tests
 # --------------------------------------------------------------------------
 e = ExprId('x', 32)
-ez3 = Translator.to_language('z3').from_expr(e)
+ez3 = translator1.from_expr(e)
 
 z3_e = z3.BitVec('x', 32)
 assert equiv(ez3, z3_e)
@@ -63,7 +67,7 @@ assert equiv(ez3, z3_e)
 four = ExprInt(4, 32)
 five = ExprInt(5, 32)
 e2 = (e + five + four) * five
-ez3 = Translator.to_language('z3').from_expr(e2)
+ez3 = translator1.from_expr(e2)
 
 z3_four = z3.BitVecVal(4, 32)
 z3_five = z3.BitVecVal(5, 32)
@@ -74,7 +78,7 @@ assert equiv(ez3, z3_e2)
 emem = ExprMem(ExprInt(0xdeadbeef, 32), size=32)
 emem2 = ExprMem(ExprInt(0xfee1dead, 32), size=32)
 e3 = (emem + e) * ExprInt(2, 32) * emem2
-ez3 = Translator.to_language('z3').from_expr(e3)
+ez3 = translator1.from_expr(e3)
 
 mem = Z3Mem()
 z3_emem = mem.get(z3.BitVecVal(0xdeadbeef, 32), 32)
@@ -84,7 +88,7 @@ assert equiv(ez3, z3_e3)
 
 # --------------------------------------------------------------------------
 e4 = emem * five
-ez3 = Translator.to_language('z3').from_expr(e4)
+ez3 = translator1.from_expr(e4)
 
 z3_e4 = z3_emem * z3_five
 assert equiv(ez3, z3_e4)
@@ -98,7 +102,7 @@ check_interp(model[mem.get_mem_array(32)],
              [(0xdeadbeef, 2), (0xdeadbeef + 3, 0)])
 
 # --------------------------------------------------------------------------
-ez3 = Translator.to_language("z3", endianness=">").from_expr(e4)
+ez3 = translator2.from_expr(e4)
 
 memb = Z3Mem(endianness=">")
 z3_emem = memb.get(z3.BitVecVal(0xdeadbeef, 32), 32)
@@ -115,7 +119,7 @@ check_interp(model[memb.get_mem_array(32)],
 
 # --------------------------------------------------------------------------
 e5 = ExprSlice(ExprCompose(e, four), 0, 32) * five
-ez3 = Translator.to_language('z3').from_expr(e5)
+ez3 = translator1.from_expr(e5)
 
 z3_e5 = z3.Extract(31, 0, z3.Concat(z3_four, z3_e)) * z3_five
 assert equiv(ez3, z3_e5)
@@ -126,7 +130,7 @@ seven = ExprInt(7, 32)
 one0seven = ExprInt(0x107, 32)
 for miasm_int, res in [(five, 1), (four, 0), (seven, 0), (one0seven, 0)]:
     e6 = ExprOp('parity', miasm_int)
-    ez3 = Translator.to_language('z3').from_expr(e6)
+    ez3 = translator1.from_expr(e6)
     z3_e6 = z3.BitVecVal(res, 1)
     assert equiv(ez3, z3_e6)
 
@@ -134,37 +138,40 @@ for miasm_int, res in [(five, 1), (four, 0), (seven, 0), (one0seven, 0)]:
 # '-'
 for miasm_int, res in [(five, -5), (four, -4)]:
     e6 = ExprOp('-', miasm_int)
-    ez3 = Translator.to_language('z3').from_expr(e6)
+    ez3 = translator1.from_expr(e6)
     z3_e6 = z3.BitVecVal(res, 32)
     assert equiv(ez3, z3_e6)
 
 # --------------------------------------------------------------------------
-e7 = ExprId(AsmLabel("label_histoire", 0xdeadbeef), 32)
-ez3 = Translator.to_language('z3').from_expr(e7)
+label_histoire = symbol_pool.add_location("label_histoire", 0xdeadbeef)
+e7 = ExprLoc(label_histoire, 32)
+ez3 = translator1.from_expr(e7)
 z3_e7 = z3.BitVecVal(0xdeadbeef, 32)
 assert equiv(ez3, z3_e7)
 
 # Should just not throw anything to pass
-e8 = ExprId(AsmLabel("label_jambe"), 32)
-ez3 = Translator.to_language('z3').from_expr(e8)
+lbl_e8 = symbol_pool.add_location("label_jambe")
+
+e8 = ExprLoc(lbl_e8, 32)
+ez3 = translator1.from_expr(e8)
 assert not equiv(ez3, z3_e7)
 
 # --------------------------------------------------------------------------
 # cntleadzeros, cnttrailzeros
 
 # cnttrailzeros(0x1138) == 3
-cnttrailzeros1 = Translator.to_language('z3').from_expr(ExprOp("cnttrailzeros", ExprInt(0x1138, 32)))
+cnttrailzeros1 = translator1.from_expr(ExprOp("cnttrailzeros", ExprInt(0x1138, 32)))
 cnttrailzeros2 = z3.BitVecVal(3, 32)
 assert(equiv(cnttrailzeros1, cnttrailzeros2))
 
 # cntleadzeros(0x11300) == 0xf
-cntleadzeros1 = Translator.to_language('z3').from_expr(ExprOp("cntleadzeros", ExprInt(0x11300, 32)))
+cntleadzeros1 = translator1.from_expr(ExprOp("cntleadzeros", ExprInt(0x11300, 32)))
 cntleadzeros2 = z3.BitVecVal(0xf, 32)
 assert(equiv(cntleadzeros1, cntleadzeros2))
 
 # cnttrailzeros(0x8000) + 1 == cntleadzeros(0x8000)
-cnttrailzeros3 = Translator.to_language('z3').from_expr(ExprOp("cnttrailzeros", ExprInt(0x8000, 32)) + ExprInt(1, 32))
-cntleadzeros3 = Translator.to_language('z3').from_expr(ExprOp("cntleadzeros", ExprInt(0x8000, 32)))
+cnttrailzeros3 = translator1.from_expr(ExprOp("cnttrailzeros", ExprInt(0x8000, 32)) + ExprInt(1, 32))
+cntleadzeros3 = translator1.from_expr(ExprOp("cntleadzeros", ExprInt(0x8000, 32)))
 assert(equiv(cnttrailzeros3, cntleadzeros3))
 
 print "TranslatorZ3 tests are OK."