Changeset 103294 in webkit for trunk/Source/JavaScriptCore/dfg/DFGGPRInfo.h

Timestamp:

Dec 19, 2011, 7:16:21 PM (13 years ago)

Author:

[email protected]

Message:

​https://bugs.webkit.org/show_bug.cgi?id=74903
Exceptions not thrown correctly from DFG JIT on 32bit

Reviewed by Oliver Hunt.

Arguments for lookupExceptionHandler are not setup correctly.
In the case of ARMv7 we rely on lr being preserved over a call,
this in invalid. On x86 we don't should be poking the arguments onto the stack!

Source/JavaScriptCore:

• bytecode/CodeBlock.h:

(JSC::CodeBlock::bytecodeOffsetForCallAtIndex):

• dfg/DFGAssemblyHelpers.h:

(JSC::DFG::AssemblyHelpers::restoreReturnAddressBeforeReturn):

• dfg/DFGGPRInfo.h:
• dfg/DFGJITCompiler.cpp:

(JSC::DFG::JITCompiler::compileBody):

• dfg/DFGJITCompiler.h:

(JSC::DFG::JITCompiler::addExceptionCheck):
(JSC::DFG::JITCompiler::addFastExceptionCheck):

• dfg/DFGOperations.cpp:
• dfg/DFGOperations.h:

LayoutTests:

• fast/js/dfg-exception-expected.txt: Added.
• fast/js/dfg-exception.html: Added.
• fast/js/script-tests/dfg-exception.js: Added.

(doesntDFGCompile):
(test):

File:

• trunk/Source/JavaScriptCore/dfg/DFGGPRInfo.h (modified) (3 diffs)

trunk/Source/JavaScriptCore/dfg/DFGGPRInfo.h

@@ -274 +274 @@
     static const GPRReg returnValueGPR = X86Registers::eax; // regT0
     static const GPRReg returnValueGPR2 = X86Registers::edx; // regT1
+    static const GPRReg nonPreservedNonReturnGPR = X86Registers::ecx;
 
     static GPRReg toRegister(unsigned index)
@@ -344 +345 @@
     static const GPRReg returnValueGPR = X86Registers::eax; // regT0
     static const GPRReg returnValueGPR2 = X86Registers::edx; // regT1
+    static const GPRReg nonPreservedNonReturnGPR = X86Registers::esi;
 
     static GPRReg toRegister(unsigned index)
@@ -416 +418 @@
     static const GPRReg returnValueGPR = ARMRegisters::r0; // regT0
     static const GPRReg returnValueGPR2 = ARMRegisters::r1; // regT1
+    static const GPRReg nonPreservedNonReturnGPR = ARMRegisters::r2;
 
     static GPRReg toRegister(unsigned index)