runtime/vm/assembler_mips.cc - Issue 1096063002: Fix array allocation overflow check on arm/arm64/mips.

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Unified Diff: runtime/vm/assembler_mips.cc

Issue 1096063002: Fix array allocation overflow check on arm/arm64/mips. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/

Patch Set: Created 5 years, 8 months ago

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Index: runtime/vm/assembler_mips.cc

===================================================================

--- runtime/vm/assembler_mips.cc (revision 45353)

+++ runtime/vm/assembler_mips.cc (working copy)

@@ -872,6 +872,7 @@

const uword top_address = heap->TopAddress(space);

LoadImmediate(temp_reg, top_address);

lw(instance_reg, Address(temp_reg));

+ // TODO(koda): Protect against unsigned overflow here.

AddImmediate(instance_reg, instance_size);

// instance_reg: potential next object start.

@@ -914,8 +915,9 @@

LoadImmediate(temp1, heap->TopAddress(space));

lw(instance, Address(temp1, 0)); // Potential new object start.

// Potential next object start.

- AddImmediateDetectOverflow(end_address, instance, instance_size, CMPRES1);

- bltz(CMPRES1, failure); // CMPRES1 < 0 on overflow.

+ AddImmediate(end_address, instance, instance_size);

+ // Branch on unsigned overflow.

+ BranchUnsignedLess(end_address, instance, failure);

// Check if the allocation fits into the remaining space.

// instance: potential new object start.

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